The purpose of the present invention is to provide a novel use of bamboo on the basis of a new function thereof.A method for producing a fermented bamboo extract comprises: a milling step for milling bamboo to give a bamboo powder; a fermentation step for fermenting the bamboo powder with the use of a lactic acid bacterium to give a fermented bamboo; and an extraction step for extracting the fermented bamboo with hot water to give an extract.