An assist grip comprising: a retainer (1, 1A) including a fixed section fixed to a mounting surface of a panel and the like, and a pair of journaling sections; and a grip main body including a pair of recessed sections provided on two ends in a longitudinal direction, a guide groove formed at least on one of inner surfaces facing each other in a longitudinal direction among inner surfaces of the recessed section, the journaling section being slidable on the guide groove, and bearing holes provided on a coaxial line on both of the inner surfaces, the grip main body being rotated with the journaling section as a fulcrum to be switched between a storage position along the mounting surface and a use position protruding from the mounting surface, wherein the guide groove extends from an opening edge of the recessed section to an inner bottom surface side, and at least one of the bearing holes on both of the inner surfaces includes an elastic locking piece (25, 27) that is positioned at a terminal of the guide groove or the bearing hole and allows fitting of or locks an end section of the journaling section, or the bearing hole has any of a configuration of being provided to be connected to the terminal of the guide groove, a configuration of including an elastic locking piece (25, 27) that is positioned at the terminal of the guide groove or the bearing hole and allows fitting of or locks an end section of the journaling section, and a configuration of being provided irrespective of the guide groove, wherein when the retainer (1, 1A) is mounted on the grip main body, a width between both of the inner surfaces is widened by insertion of the journaling section corresponding to the guide groove formed at least on either one of both of the inner surfaces, so that each of the journaling sections is fitted to a corresponding one of the bearing holes, characterized in that when the guide groove extends from an opening edge of the recessed section to the inner bottom surface side, and at least one of bearing holes of both of the inner surfaces has the elastic locking piece (25, 27) that is positioned at the terminal of the guide groove or the bearing hole and allows fitting of or locks the end section of the journaling section, the elastic locking piece includes a claw (25a, 27a) that protrudes from a front end and is used for preventing removal, and the claw is switched between a fitting state and a fitting released state with swinging of the elastic locking piece (25, 27). a retainer (1, 1A) including a fixed section fixed to a mounting surface of a panel and the like, and a pair of journaling sections; and a grip main body including a pair of recessed sections provided on two ends in a longitudinal direction, a guide groove formed at least on one of inner surfaces facing each other in a longitudinal direction among inner surfaces of the recessed section, the journaling section being slidable on the guide groove, and bearing holes provided on a coaxial line on both of the inner surfaces, the grip main body being rotated with the journaling section as a fulcrum to be switched between a storage position along the mounting surface and a use position protruding from the mounting surface, wherein the guide groove extends from an opening edge of the recessed section to an inner bottom surface side, and at least one of the bearing holes on both of the inner surfaces includes an elastic locking piece (25, 27) that is positioned at a terminal of the guide groove or the bearing hole and allows fitting of or locks an end section of the journaling section, or the bearing hole has any of a configuration of being provided to be connected to the terminal of the guide groove, a configuration of including an elastic locking piece (25, 27) that is positioned at the terminal of the guide groove or the bearing hole and allows fitting of or locks an end section of the journaling section, and a configuration of being provided irrespective of the guide groove, wherein when the retainer (1, 1A) is mounted on the grip main body, a width between both of the inner surfaces is widened by insertion of the journaling section corresponding to the guide groove formed at least on either one of both of the inner surfaces, so that each of the journaling sections is fitted to a corresponding one of the bearing holes, characterized in that when the guide groove extends from an opening edge of the recessed section to the inner bottom surface side, and at least one of bearing holes of both of the inner surfaces has the elastic locking piece (25, 27) that is positioned at the terminal of the guide groove or the bearing hole and allows fitting of or locks the end section of the journaling section, the elastic locking piece includes a claw (25a, 27a) that protrudes from a front end and is used for preventing removal, and the claw is switched between a fitting state and a fitting released state with swinging of the elastic locking piece (25, 27).