A latch module includes a latch including a hook for engaging with a pin, a spring that applies a force to move the latch in a first direction; and a motor to pivot the latch. The hook is opened at a front end toward the first direction that opens to an engaging surface provided in the hook for engaging with the pin and the engaging surface includes a disengaging inclined surface that is disposed at a front end portion of the hook and a secure lock surface that is disposed behind the disengaging inclined surface. The disengaging inclined surface has an inclined surface inclined in the first direction and the secure lock surface has an inclined surface inclined in a second direction opposite the first direction. In a first basic position of the latch, the disengaging inclined surface of the hook is positioned to engage with the pin. In a second basic position of the latch, the engaging surface of the hook is positioned to release the pin. In a third basic position of the latch, the secure lock surface of the hook is positioned to engage with the pin.