A first link (20) rotatably supported at a base member (10) of which a rotational motion is imparted by a pull member (e.g., wire 70), a second link (30) rotatably supported at the base member (10), a latch (40) including a hook-like portion (43) engageable with a rod-like portion (91), and a transmission mechanism (actuating lever 50) configured to transmit a rotational motion of the second link (30) to the latch (40) and to cause the latch to make a rotational motion are included. The first link (20) has a first action surface (24A) and a second action surface (25). The pulling operation made by the pull member (70) causes the first action surface (24A) to push a contact surface (33A), causing the second link (30) to make a rotational motion, and causes a surface of the first link (20) in contact with the second link (30) to be switched, partway through the pulling operation made by the pull member (70), from the first action surface (24A) to the second action surface (25).