This is a frozen kazunoko (herring roe) matsumae-zuke (a Hokkaido-style pickled dish made with herring roe, kelp, and squid) sold on Rakuten Ichiba by 釜庄. Its ingredient list gives the origin of the kazunoko as the Netherlands, Germany and other countries. The product name includes 竹田食品, and it is sold under the name 数の子コロコロ (Kazunoko Korokoro). Because broken pieces (oreko) and loose eggs (bara-ko) are included, it is a “wakeari” (a Japanese shopping label for items sold with a stated reason) grade. For the 500g × 1 pack, this article organizes the contents, shelf life, noshi paper (gift wrapping label) and reviews from the Rakuten Ichiba product page and reviews. The features are that it contains about 60% kazunoko (as stated by the shop), that the reason for the wakeari label is written on the product page, and that there are 4 sizes from 500g to 3kg.
At a Glance
Key points
- About 60% kazunoko (as stated by the shop). Among the 3 kazunoko matsumae-zuke featured on Ochinity (as of October 18, 2026), 60% applies to this product and 海産物店ミツワ, while ほっきょ庵 has sizes at 50% and 35%
- Wakeari, with broken pieces and loose eggs included. The reason is written on the product page. However, some reviews (the first 59 in the default order plus some of the 1★ and 2★ reviews, 103 in total; posted from February 2012 to October 2026, the latest in October 2026, and they may not reflect the product’s current condition) mention many crumbled pieces
- Arrives frozen, and noshi paper is supported. The page says to thaw it naturally in the refrigerator for 5 to 8 hours and that it cannot be refrozen. The kinds of inscription for the noshi paper are not confirmed
- Rakuten rating 4.5 (1,131 reviews). The review count is the highest among the 10 kazunoko items featured on Ochinity (as of October 18, 2026) (the rating is in the middle of the 4.27 to 4.84 range)
Watch out for
- The flavor is strong and the texture of the kazunoko is on the soft side. This is also written in the product name, and reviews mention that it is salty and has little bite (a trend within the 103 reviews we read; it may not reflect the product’s current condition)
Suits: People who want plenty of matsumae-zuke with kazunoko for osechi (traditional Japanese New Year’s food) or as a side for drinks, and who don’t mind the strong flavor and soft texture
The scope of the comparison is the 10 kazunoko items featured on Ochinity and, among them, the 3 matsumae-zuke (as of October 18, 2026). Each value is as of the date its own article was researched and may differ from the current listing. The features are from the Rakuten Ichiba product page (viewed October 18, 2026). The rating is as shown on Rakuten (viewed October 18, 2026) and may not reflect the product’s current condition. The review trends are those within the range we read.
Compared with 10 Kazunoko Items
Among the 10 kazunoko items featured on Ochinity (as of October 18, 2026). Each value is as of the date its own article was researched and may differ from the current listing. Ratings are as shown on Rakuten, and the fewer the reviews, the more easily the figure moves. The rows follow the Japanese gojūon (syllabary) order of the product names, with this article first.
| Product | Amount | Delivery temperature | Rakuten rating |
|---|---|---|---|
| 釜庄 Kazunoko Matsumae-zuke KorokoroThis article, matsumae-zuke | 500g4 sizes, up to 3kg | Frozen | 4.51,131 reviews |
| 越前かに職人甲羅組 Seasoned Kazunoko | 500g | Frozen | 4.34674 reviews |
| Wakeari Seasoned Kazunoko for Commercial Use, Broken Type | 500g | Frozen | 4.72116 reviews |
| 海産物店ミツワ Kazunoko Matsumae-zukematsumae-zuke, 60% kazunoko | 500g3 sizes, up to 2kg | Frozen | 4.58890 reviews |
| 金沢まいもん寿司 Seasoned Kazunoko 500g | 500g | Frozen | 4.44227 reviews |
| 金沢まいもん寿司 Seasoned Kazunoko 1kg | 1kg | Frozen | 4.27145 reviews |
| Kazunoko Matsumae-zuke, Wakeari (ほっきょ庵)matsumae-zuke, 50% / 35% kazunoko | 500g, 1kg | Frozen | 4.5327 reviews |
| ましけマルシェ Seasoned Kazunoko, Wakeari | 500g | Frozen | 4.71284 reviews |
| ますよね Seasoned Kazunoko “Honchan” | 450g150g × 3 bags | Frozen | 4.42785 reviews |
| Wakeari Large Salted Kazunoko 1kg | 1kg | Chilledambient delivery from December to March | 4.84513 reviews |
You can go to each product’s article from its name. The amount is the value stated in each article, and for products with several sizes it is shown as a range from the smallest.
- The Rakuten review count of 1,131 is the highest among the 10 kazunoko items featured (as of October 18, 2026). The rating is 4.5, and the 10 items range from 4.27 to 4.84
- There are 3 matsumae-zuke (this product, 海産物店ミツワ and ほっきょ庵). The kazunoko share is 60% for this product and ミツワ, and 50% and 35% for the sizes of ほっきょ庵 (a weak point: the share is as stated by the shop, and we did not find a stated basis for it for this product)
Basic Information
- Product Name
- 釜庄 Kazunoko Matsumae-zuke (Kazunoko Korokoro) 500g × 1 (the product name includes 竹田食品)
- Amount
- 500g per pack. 4 options: 500g × 1, × 2, × 4 and × 6
- Wakeari
- Because broken pieces (oreko) and loose eggs (bara-ko) are included
- Storage
- Keep frozen (−18°C). The page says it cannot be refrozen
- Best-Before Date
- Stated on the product. The page says items with at least 60 days remaining, counting the shipping day, are shipped
- Allergen Labeling
- Wheat, squid, mackerel, soybean
- Noshi / Gift
- Noshi paper is supported (the kinds of inscription are Not confirmed)
This list transcribes what is stated on the product page. However, the “Not confirmed” labels and any notes we add are our own.
The allergen labeling is from the ingredient name field: “contains wheat, squid, mackerel and soybean (in part)”. If you have an allergy, ask the seller before buying, or be sure to check the label on the product when it arrives (Reference: Consumer Affairs Agency, Japan, “About Allergen Labeling”, accessed October 18, 2026).
See the transcribed details, sources and “Not confirmed” items (17 items)
This list transcribes what is stated on the product page. However, the “Not confirmed” labels and any notes we add are our own.
- Product Name
- 松前漬け 数の子 函館竹田 竹田食品 無着色 数の子コロコロ 500g per pack. It is shortened here to “釜庄 Kazunoko Matsumae-zuke (Kazunoko Korokoro) 500g × 1”Source: Rakuten Ichiba product page (accessed October 18, 2026). The product name shown on the Rakuten page is a long string with many search keywords
- Amount
- 500g per pack. This article covers 500g × 1. The number of servings is Not confirmedSource: Rakuten Ichiba product page
- Choices
- 500g × 1 / 500g × 2 (1kg in total) / 500g × 4 (2kg in total) / 500g × 6 (3kg in total)Source: the size selection field of the Rakuten Ichiba product page (accessed October 18, 2026)
- Reason for Wakeari
- The page says it is sold as a wakeari item because broken pieces (oreko) and loose eggs (bara-ko) are includedSource: the product description of the Rakuten Ichiba product page
- Kazunoko Share
- The page says it contains about 60% (as stated by the shop; we did not find a stated basis for the share)Source: the product description of the Rakuten Ichiba product page
- Ingredients
- Kazunoko (herring roe) (the Netherlands, Germany, other), compound seasoning liquid (soy sauce, sugar, mirin, other), dried squid, kelp, salt, chili pepper / sweetener (sorbitol), seasoning (amino acids, etc.), pH adjuster, thickening polysaccharides, alcohol. Contains wheat, squid, mackerel and soybean (in part)Source: the food labeling of the Rakuten Ichiba product page
- Nutrition
- Per 100g: energy 126kcal, protein 13.6g, fat 2.0g, carbohydrate 13.7g, salt equivalent 3.6g (estimated values)Source: the food labeling of the Rakuten Ichiba product page
- Storage Method
- Keep frozen (−18°C). The page says to keep it in the refrigerator (10°C or below) after thawing and to eat it as soon as possible. The number of days it keeps after thawing is Not confirmedSource: Rakuten Ichiba product page
- Best-Before Date
- Stated on the product. The page says items with at least 60 days remaining, counting the shipping day, are shippedSource: Rakuten Ichiba product page
- How to Thaw
- It arrives frozen, and the page says to thaw it naturally in the refrigerator for 5 to 8 hours. The page says it cannot be refrozenSource: the serving instructions of the Rakuten Ichiba product page
- Country of Origin of Ingredients
- The ingredient name lists the kazunoko as from the Netherlands, Germany and other countries. The origin of the other ingredients is Not confirmedSource: the food labeling of the Rakuten Ichiba product page
- Processing Location
- The page says it is processed in Hokkaido. The location of the processing plant is Not confirmedSource: the product description of the Rakuten Ichiba product page
- Condition / How to Eat (Cooking Required?)
- It is a seasoned matsumae-zuke that arrives frozen. We did not find a statement on whether heating is neededSource: Rakuten Ichiba product page
- Shipping
- It is delivered by frozen courier. As a guide, orders placed by 13:00 Monday to Saturday and by 9:00 on Sunday are shipped the same day (excluding prepayment)Source: Rakuten Ichiba product page (accessed October 18, 2026)
- Manufacturer
- The seller is stated as 株式会社釜庄 (Iwaki City, Fukushima Prefecture). The manufacturer is Not confirmedSource: the food labeling of the Rakuten Ichiba product page
- Noshi / Gift
- Noshi paper can be attached. The kinds of inscription are Not confirmed. We did not find a statement on wrapping or message cards. The product name includes the words “誕生日 お祝い お礼 ギフト” (birthday, celebration, thanks, gift)Source: Rakuten Ichiba product page (accessed October 18, 2026)
- Shop
- 釜庄 楽しい食の店【本館】 (Rakuten Ichiba)
Prices are not listed here because they change. Please check the current price and stock availability at the link above.
What Public Reviews Say
We organized the Rakuten Ichiba product reviews by point. Rating figures are as of the viewing date and change afterward. The points below are trends within what we read and may not reflect the product’s current condition.
| Site | Rating | Number of Reviews | Date Accessed |
|---|---|---|---|
| Rakuten customer reviews (product page) | 4.5 / 5 | 1,131 | October 18, 2026 |
Rating breakdown: 5★ 749 / 4★ 262 / 3★ 70 / 2★ 36 / 1★ 14 (as shown on Rakuten Ichiba, viewed October 18, 2026)
What we read: the first 59 reviews in the default order (posted October 2024 to October 2026; latest October 2026), all 14 reviews rated 1★ (posted February 2012 to December 2025; 4 within the last 2 years), 30 of the 36 rated 2★ (posted January 2014 to May 2025; 3 within the last 2 years), 103 in total. These are trends within what we read and may not reflect the product’s current condition.
The 1★ and 2★ reviews total 50, and the 44 we read are mostly older posts. The counts below are approximate figures from our reading of the text, and do not include posts that are only about shipping or the shop’s service.
What Reviewers Praise
The kazunoko are large and plentiful (about 23 of the 59)
About 23 of the 59 reviews in the default order said the kazunoko are large and come in generous amounts, with a satisfying bite. Mostly 5★ reviews.
Goes well with rice and drinks (about 17)
About 17 of the 59 reviews in the default order said it goes well with rice or as a side for drinks. These are 4★ or 5★ reviews.
Bought for osechi or the year-end and New Year holidays (about 11)
About 11 of the 59 reviews in the default order said they bought it for osechi or the year-end and New Year holidays, or that they buy it again every year.
Source: Rakuten customer reviews (accessed October 18, 2026)
What Reviewers Note
Strong flavor, too salty (about 11 of the 59 in the default order / about 17 of the 44 rated 1★ or 2★)
Reviews saying the flavor is strong or too salty. About 11 of the 59 in the default order and about 17 of the 44 rated 1★ or 2★ that we read. The default-order reviews also include some that say it is strong but to their liking.
How to check: the product name says the flavor is on the strong side. The salt equivalent is 3.6g per 100g (estimated value), as given in “Basic Information” in this article.
The kazunoko texture is soft (about 3 of the 59 in the default order / about 15 of the 44 rated 1★ or 2★)
Reviews saying the kazunoko have little bite or are soft. About 3 of the 59 in the default order and about 15 of the 44 rated 1★ or 2★ that we read. The 1★ and 2★ reviews are mostly from 2019 to February 2025.
How to check: the product name says the kazunoko texture is on the soft side.
Many crumbled kazunoko / seemed smaller (about 3 of the 59 in the default order / about 9 of the 44 rated 1★ or 2★)
Reviews saying the kazunoko were crumbled with few intact pieces, or that they seemed smaller than before. About 3 of the 59 in the default order and about 9 of the 44 rated 1★ or 2★ that we read.
How to check: the reason for the wakeari label (broken pieces and loose eggs) is given in “Basic Information” in this article.
Source: Rakuten customer reviews (accessed October 18, 2026)
Summary: Is This the One for You?
Why choose it: You want a matsumae-zuke with about 60% kazunoko in a wakeari grade with broken pieces and loose eggs, and you don’t mind a strong flavor and a soft texture. If those two are your conditions, this product fits (a weak point: some reviews mention many crumbled pieces).
- The kazunoko share is about 60% (as stated by the shop). Among the 3 matsumae-zuke featured (as of October 18, 2026), the one with the same 60% is ミツワ
- The Rakuten rating is 4.5 (1,131 reviews), and the review count is the highest among the 10 kazunoko items featured. Of the 59 reviews we read in the default order, about 23 mentioned the size of the kazunoko
- It arrives frozen and noshi paper is supported. There are 4 sizes, from 500g × 1 to 3kg
Other options: for the same 60% kazunoko, there is 海産物店ミツワ Kazunoko Matsumae-zuke (500g to 2kg, Rakuten rating 4.58, 890 reviews). For sizes with 50% and 35% kazunoko, there is Kazunoko Matsumae-zuke, Wakeari (ほっきょ庵) (500g and 1kg, rating 4.5, 327 reviews).
The basis for this section is the Rakuten Ichiba product page and Rakuten customer reviews (accessed October 18, 2026). These are trends in the reviews within what we read and may not reflect the product’s current condition.
Prices, stock, shipping fees, and delivery dates are subject to change. This article’s information-as-of date is October 18, 2026. Please be sure to check the listing at the link before purchasing.
This article contains affiliate links (advertising). Editorial Policy
This article summarizes information publicly available on retail sites and review sites. Product details such as amount, storage method, and ingredients are subject to change. Please check the seller’s listing for the most current information.
Comments on taste or quality are summarized from third-party posts cited with their source, and are not Ochinity’s own evaluation. Our approach to writing articles is described in our Editorial Policy.
Information as of: October 18, 2026 / Sources: Rakuten Ichiba product page (釜庄 楽しい食の店【本館】), Rakuten customer reviews, Consumer Affairs Agency, Japan, “About Allergen Labeling”
