An automobile has an openable/closable mechanism including a box and a lid such as a glove box. A damper is provided to the edge of a box the glove box. When a lid of the glove box is closed, the damper functions to suppress the collision shook between the lid and the box with the elastic force by abutting on the lid.
The damping part described in Patent Document 1 includes a casing having a bottomed cylindrical shape, a retainer having a bottomed cylindrical shape and housed in the casing, and a spring abutting on the bottom of the casing and the bottom of the retainer to bias the retainer in a direction that the retainer protrudes out from an opening portion of the casing. A retaining protrusion provided on a lateral face of the retainer is engaged into an engagement window provided on a lateral face of the casing, and thereby retaining the retainer the biasing force of the spring.