What is Koji Lid (Morobuta / Kojibuta) Size S --Locally Made 100% Natural Japanese Cedar Wood? Koji Lid size small is a professional-style container that is ideal for making koji...

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What is Koji Lid (Morobuta / Kojibuta) Size S --Locally Made 100% Natural Japanese Cedar Wood?

Koji Lid size small is a professional-style container that is ideal for making koji at home. The Koji lid, in Japanese called kojibuta or morobuta, is the proper tool to make koji. This product is currently hard to find in the market.

Crafted With local Japanese cedar wood, this product is constructed by hand one part after another by skillful craftmans. This product has the perfect size for our Household Koji Fermenter PF100-48H. Each S size koji lid can fit into one section of the fermenter. One fermenter has 3 sections, so you can easily make a lot of koji at home.

Jiuqu lid S size

Uses “Nagara Cedar” from Gifu Prefecture

Nagara cedar refers to cedars that are produced in the Nagara River basin in Gujo District and Takegi District in Gifu Prefecture. The name means “long and good cedar”. Cedar is suitable for making koji because it has no natural antibacterial effect like cypress.

Nagara cedar

One Koji Lid Can Make Up to 1kg of Rice Grain

You can make up to 1kg of rice grain in one container with a Size S lid.
Combined with Household Koji Fermenter , you can make up to 3 kg of rice grain at a time.

Up to 1 kg

Just The Right Size for The Household Koji Fermenter PF100-48H

Combined with Household Koji Fermenter , you can make koji rice in big quantity.

Click here to buy Household Koji Fermenter.

Up to 3 boxes

No Preservatives Used

No preservatives are applied to general building materials. You can use it safely.

No preservative processing
The thickness of the board is 1 cm


Koji Lid Size S

Jiuqu lid S size
  • 1. 26cm
  • 2. 19,5 cm
  • 3.4 cm
  • 4. 28cm
  • 5. 21,5 cm
  • 6. 5,5 cm

How To Care For Koji Lid

> Koji lid is made of wood, therefore do not store in humid places for it can cause mold to grow.
After each use, wash with water and then wipe the water thoroughly and let it dry in well-ventilated room.
If you find mold growing on your koji lid, try wiping it off with rubbing alcohol or shochu with high level of alcohol.
If the mold is already growing too deep, scrape it off.

Role of The Koji Lid

Koji lid, commonly known as kojibuta, is a small container that has been used for a long time in koji making (the process of propagating yeast cell on steamed rice).
Koji making takes place in a hot and humid specialized room called Kojimuro, which takes 48 to 56 hours. However, due to the nature of the room, various parts like the center and corners, front and back, whether it's close to the ceiling or near the tatami floor, can have different temperature and humidity. Therefore, the rice is divided into small portions on this koji lid, and the lid placement is regularly moved to adjust the conditions of all rice to be the same in terms of temperature and humidity. By moving and reloading every 3 hours, all the lids that are stacked in the corners of the room are moved to the center, the lids that are in the back are moved to the front, the lids stacked in the upper row are moved to The lower row, and so on. By doing this, the yeast cell will be uniformly propagated in the rice grain.

Advantages of koji lid method

Compared to machine-made koji (manufactured by automatically controlling the heat generation of koji), the finish of koji is much better. That is all. Even in sake breweries, when it comes to sake that are in junmai or ginjo classification, most of The breweries are made using this lid method. After all, there are some aspects in the world of brewing that are not yet understood by the power of science or machinery. Moreover, the finish of koji affects not only sake but also miso and soy sauce . The koji, which is in good quality even after the preparation, works well.

Disadvantages of the koji lid method

The disadvantage of this method is keeping the temperature control. Because temperature control is difficult, it takes more energy and attention regardless of morning or night. Also, if there are a large number of koji lid, it will require more labor.

We also sell cotton cloth for koji making (40 × 90cm)
The cloth is made using thin and soft material so it will not damage the ingredients. It is made with 100% local Japanese cotton.

Purchase our cotton cloth here → Cotton Cloth for Koji Lid

The Amount of Koji Rice And The Amount of Rice to Use

The Amount of Rice

The Amount of Finished Koji Rice (Approximation)

koji rice quantity
koji rice quantity
koji rice quantity
koji rice quantity
koji rice quantity
koji rice quantity

The Amount of Finished Miso And The Amount of Ingredients to Use

Miso (Approximation)

Koji Rice



miso ingredient
miso ingredient

Check out how to make Koji Rice here → >> How to Make Koji Rice

Koji Lid Size S

Product Detail Product Detail

Size Size 28 cm x 21.5 cm x Height 5.5 cm
Material Cedar Wood
Notes This Product is made with natural material, therefore the wood grain and color may be different in each koji lid. In particular, wood grain may vary greatly from item to item. In this regard, customers are not allowed to select products. We apologize, but thank you in advance for your understanding.
Koji lid

Koji Lid Size

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