The purpose of the present invention is to provide a microneedle patch applicator and a microneedle patch applicator housing, whereby perpendicular penetration properties of the needle into skin are enhanced. A microneedle patch applicator housing (11) has a flat peripheral base part (12) configured from a single sheet or film, and a protruding part (13) which is surrounded by the peripheral base part and bulges perpendicularly upward toward a top surface from a bottom surface with respect to the peripheral base part. A bottom-surface portion of the protruding part (13) constitutes part of a microneedle patch support surface (42). The protruding part (13) is provided with a plurality of recessed fold parts (24), and the recessed fold parts (24) have recess bottoms oriented in the direction away from a center part of the protruding part (13).
