To provide powdered Nemacystus decipiens for a cosmetic, capable of exhibiting a medicinal/cosmetic effect which the Nemacystus decipiens has, and to provide a cosmetic pack, shampoo, rinse, and soap which are each produced by kneading the powdered Nemacystus decipiens with a liquid, such as water, so as to be formed into a pasty form.

This powdered Nemacystus decipiens for the cosmetics is produced by drying raw Nemacystus decipiens 1 with a drying means 19 so as to have a water content of 5-7% and pulverizing the dried Nemacystus decipines with a pulverizing means 30 so as to form the powdered Nemacystus decipiens 40B having a particle size of about 10-50 μm. The powdered Nemacystus decipiens is appropriately dissolved in the liquid W, such as water, so as to be formed into a fluid R having a proper viscosity, and then the fluid R is directly applied to the surface of human skin H.