To provide a skin care preparation for external use and a cosmetic for preventing/improving aging of the skin by preparing a water extract of fruit body fine powder of Phellinus baumii strain which is a basidiomycete and using the extract.

Hot water extract of fruit body fine powder of Phellinus baumii succeeded in the artificial culture has all of ultraviolet rays-blocking effect, harmful active oxygen production-preventing effect and activation and proliferation-promoting effect on dermal fibroblast. The skin care preparation for external use and the cosmetic each having excellent prevention and improvement effects on exogenous and endogenic skin aging symptoms such as wrinkle on the skin, lowering of skin elasticity, chapped skin, liver spot, inflammation, or the like are obtained by formulating the extract.