PROBLEM TO BE SOLVED: To provide a percutaneous administration device that enables medicine to be easily administered to an administration target.SOLUTION: A microneedle includes a substrate 11 including a surface 11S, and projection part 12 that projects from the surface 11S. The projection part 12 includes a first projection 21 that projects from the surface 11S and includes a tip 21a that is in contact with the surface 11S and a tip 21b opposite to the tip 21a, and at least one second projection group 22G composed of a plurality of second projections 22 projecting from the outer peripheral surface 21S of the first projection 21. Each of the second projections 22 is located on a virtual line VL unique to the second projection group 22G to which the second projection 22 belongs, which extends linearly along the outer peripheral surface 21S from the tip 21b to the tip 21a.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】投与対象に薬剤を投与されやすくすることを可能とした経皮投与デバイスを提供する。【解決手段】マイクロニードルは、表面11Sを含む基体11と、表面11Sから突き出た突起部12と、を備える。突起部12は、表面11Sから突き出るとともに、表面11Sに接する基端部21aと基端部21aとは反対側の先端部21bとを含む第1突起21と、第1突起21の外周面21Sから突き出た複数の第2突起22から構成される少なくとも1つの第2突起群22Gと、を備える。各第2突起22は、第2突起22の属する第2突起群22Gに固有の仮想線VL上であって、外周面21Sに沿って先端部21bから基端部21aに向けて直線状に延びる仮想線VL上に位置する。【選択図】図2
