A transdermal administration device housing includes a transdermal administration device and an outer package, the transdermal administration device including: an administration section which includes a substrate having a first surface and a second surface which is opposite from the first surface, and a projection which protrudes from the first surface； and a container that houses the administration section. The outer package including: a front component and a rear component, the front component facing the first surface of the substrate via the container, the rear component facing the second surface of the substrate via the container, and the front component including an opening section on the front component which is configured to be pulled open to thereby open the outer package.
