The connector with a lock structure is provided with a locking projection 13 set on an outside surface of a male housing 10, a lock arm 33 having a lock claw 35 engaging with the locking projection 13 on an outside surface of a female housing 20 through hinge-shaped leg parts 35, capable of elastic deformation, and a pressure operating lever 36 at a back end part of the lock arm 33 extending backwards from the hinge-shaped leg parts 35. Protection pillar bodies 50 extending adjacently to both sides of the back end part of the pressure operating lever of the lock arm provided set in protrusion at a rear cover housing 22, and lock shoulder parts 51 to control an upper limit of a range of movement of the pressure operating lever is provided at an upper end of the protection pillar bodies 50, and can prevent deformation and damage of a lock arm. |