PURPOSE: A manufacturing method of Sunsik is provided to produce an easily digestible brown rice that is capable of controlling chronic diseases. CONSTITUTION: A manufacturing method of Sunsik comprises the following steps. Add water to the Sunsik powder containing 20-40 wt% of roasted brown rice. Inject Bifidobacterium longum or yeast to the Sunsik powder, add water, and ferment at 25-35°;C for 30-50 hours. Freeze dry the fermented material. During the fermentation, add skimmed milk powder. A fermented Sunsik product contains 5-10 wt% of the fermented Sunsik powder. [Reference numerals] (AA) Inoculation(yeast and lactobacillus); (BB) Sunsik + water; (CC) Mixing; (DD) Fermentation; (EE) Drying; (FF) Manufacturing; (GG) Nutrient-supplemental materials본 발명은 볶은 현미를 20~40중량% 포함하는 선식 분말에 비피도 박테리움 롱검(Bifidobacterium longum) 또는 누룩을 접종하여 발효시킴으로써, 감마 아미노부티르산(γ-aminobutyric acid)의 함량 및 항산화력이 증대된 것을 특징으로 하는 발효 선식 분말 및 그 제조방법을 개시한다.