Opening/closing body lock device

A locking device for an opening and closing body that is openably and closably attached to an opening portion of a fixed body, the locking device comprising:

• a locking portion that is to be provided in one of the fixed body and the opening and closing body;
• a base that is to be disposed on another of the fixed body and the opening and closing body;
• a rotation body that is rotatably accommodated in or placed on the base and includes a protruding portion on a part of an outer periphery thereof;
• a locking member that is configured to slide in conjunction with rotation of the rotation body and configured to engage with and disengage from the locking portion;
• and
• an elastic member that includes a base portion locked and supported by a support portion provided on the base, and a stopper portion configured to restrict a maximum rotation position of the rotation body in a predetermined direction by abutting against the protruding portion of the rotation body,
• wherein the stopper portion of the elastic member protrudes in a direction in which the stopper portion is to abut against the protruding portion relative to the base portion,
• wherein a part of the outer periphery of the rotation body is provided with a sliding contact portion that is configured to come into sliding contact with the elastic member in a process in which the protruding portion approaches the stopper portion, and
• wherein the sliding contact portion protrudes from a cylindrical peripheral wall of the rotation body toward an outer diameter direction.