It is intended to provide a food which is rich in active ingredients contained in a bean (e.g., adzuki bean) peel and has the original favorable taste of the bean and a low calorie, and a method for producing a food material thereof. The present invention provides a food made of, as a raw material, a bean peel A milled into fine particles with a desired particle size by a wet milling process, and a method for producing a food material made of a bean peel as a raw material, comprising: a dehydration step S10 of dehydrating a peel A separated from boiled adzuki beans a into a predetermined water content； a primary milling step S11 of milling the peel A obtained by the dehydration step, into a desired particle size； a water addition adjustment step S12 of adjusting, by water addition, the water content of the peel powder A-1 obtained by the primary milling step, to a predetermined level； and a secondary milling step S13 of milling the peel powder A-1 obtained by the water addition adjustment step, into fine particles such that the palisade tissues of the peel powder A-1 are separated in a fine, almost rod-like form.本發明提供一種以豆類之皮作為原料的食品及其食品材料之製造方法，即提供豐富地含有包含於紅豆等豆類之皮的有效成分而且豆原有的風味良好的同時卡路里低的食品及其食品材料之製造方法。其是以藉由濕式粉碎處理細粉碎成所希望之粒子直徑的豆類之皮A作為原料的食品，而且以豆類之皮作為原料的食品及其食品材料之製造方法包括：脫水步驟S10，將燒煮之後從紅豆a分離出的皮A之含水分量脫水至既定之水分狀態；一次粉碎步驟S11，將由脫水步驟得到的皮A粉碎成所希望之粒子直徑；加水調整步驟S12，將由一次粉碎步驟得到的皮粉A-1的含水分量加水調整成既定之水分狀態；二次粉碎步驟S13，將由加水調整步驟得到的皮粉A-1之柵欄狀組織細粉碎分離成細的略棒狀。
