Transdermal administration device

The lid portion includes a main body portion covering the administration portion and the first adhesive sheet, a flange portion extending toward the edge of the main body portion on the outside of the body portion, the first adhesive among the second adhesive sheet and a flange portion affixed to the portion protruding to the outside of the sheet. Structures comprised the main body and the flange, and the remaining portion to be at least partially comprises a scheduled portion to be left in the second adhesive sheet of the flange portion, at least a portion of the body portion comprising a disconnecting portion to be a scheduled portion to be separated from the remaining portion to be comprises, a disconnect promoting portion to promote the formation of cut to separate the portion to be separated from the remaining portion to be.