PROBLEM TO BE SOLVED: To provide an apparatus, a system and a method for grinding a solid raw material in a liquid, each of which is used particularly for making soybean milk or soybean curd without using a defoaming agent excessively and copes easily with non-usage of the defoaming agent (which is a part of standards of processed foods of organic farm products) and by each of which the taste and preservable property of soybean milk or soybean curd are improved.SOLUTION: The apparatus for grinding the solid raw material in the liquid is provided with: a hopper 5 in which the solid raw material 6 and a liquid raw material 8 are thrown and a grinding chamber 12 of a grinding part for grinding the solid raw material 6 together with the liquid raw material 8. Flow regulating means S, 107 are arranged under the liquid level between the hopper 5 and the grinding chamber 12.COPYRIGHT: (C)2007,JPO&INPIT【課題】 特に豆乳・豆腐製造等において、消泡剤を必要以上に用いる必要がなく、さらには無消泡剤化(有機農産物加工食品規格対応への一部)にも対応し易く、豆乳や豆腐の風味や保存性を改善する。【解決手段】 固体原料6と液体原料8が投入供給されるホッパー5と、固体原料6を液体原料8とともに磨砕部において磨砕する磨砕室12備え、前記ホッパー5と磨砕室12の間に、かつ、液面下に制流手段S,107が設けられている。【選択図】 図1