A microneedle unit includes a microneedle including a facing surface having at least one projection and a support surface opposite to the facing surface, a recessed container having a housing space between an opening and a bottom of the recessed container for housing the microneedle such that the microneedle has the facing surface facing outside of the recessed container through the opening, and an adhering structure having a first contact surface adhered to the bottom of the recessed container and a second contact surface adhered to the support surface of the microneedle. The recessed container is deformable such that the bottom is displaced in the pressing direction, that the at least one projection is displaced in the pressing direction on an outside of the housing space, and that a portion of the second contact surface positioned outside the support surface is pushed toward the outside of the housing space.
