The purpose of the present invention is to provide a sheet-like piece comprising; a base sheet comprising an elastic material; a reservoir layer provided on the surface of said base sheet which contains a physiologically active substance and comprises micro needles; a adhesion layer which is formed in a mesh form on said base sheet and; a adhesion assisting layer which is formed on the surface of opposite side of said base sheet to the surface formed said reservoir layer. As a result, the sheet for promoting hair growth which may restore the state of thin hair to a state before thinning, a whitening and wrinkle ameliorating agent having whitening effect and wrinkle improving effect, and sheet-like piece used for these are provided.