The transdermal administration device has a first administration part comprising an outer base body having a first administration surface, an outer protrusion having a first administration function and projecting from the first administration surface, and a second administration surface. A second administration part comprising an inner substrate and an inner projection having a second administration function and projecting from the second administration surface. When the first administration part is viewed from the first direction, which is the direction facing the first administration surface, the outer base body is disposed on the ring surrounding one space, and is the second direction opposite to the second administration surface. When the second administration part is viewed from the direction, the inner base body has a shape that can be arranged in the space viewed from the first direction.経皮投与デバイスは、第１投与面を有する外側基体と、第１の投与機能を有して第１投与面から突き出た外側突起部とを備える第１投与部と、第２投与面を有する内側基体と、第２の投与機能を有して第２投与面から突き出た内側突起部とを備える第２投与部とを備える。そして、第１投与面と対向する方向である第１方向から第１投与部を見て、外側基体は１つの空間を囲う環上に配置され、第２投与面と対向する方向である第２方向から第２投与部を見て、内側基体は、第１方向から見た上記空間内に配置可能な形状を有する。
