Sheet-like piece, sheet for promoting hair growth comprising sheet-like piece, and whitening and wrinkle ameliorating agent comprising sheet-like piece

A sheet-like piece comprising:

• a base sheet made of an elastic material;
• a reservoir layer, which contains a physiologically active substance, with plural micro needles extending in opposite direction to said base sheet, being arranged on one side surface of the base sheet ;
• a mesh-formed adhesion layer formed on the opposite side surface of the reservoir layer adhered to the base sheet;
• and
• an adhesion assisting layer being detachably arranged on the opposite surface, from which said reservoir layer is formed, of said base sheet,
• wherein a tip of said micro needle protrudes from said adhesion layer;
• wherein the plural micro needles are formed on the reservoir layer, and that concave portions for forming the micro needles have a conical shape which has upper diameter of about 0.1 to 0.3 mm, bottom diameter of about 0.03 to 0.05 mm and depth of about 0.6 to 1.0 mm;
• and
• said adhesion assisting layer is composed of a spongy member.