A connector reduced in dimension in a front-rear direction by reducing the distance between an operating portion of an operation member and hooking portions of a locking member. The locking member maintains a state of a housing fitted to a mating housing, and includes a body, hooking portions provided at respective free end-side portions of the body, for being hooked to the mating housing to thereby maintain the fitted state, and a transmission portion for transmitting a force to move the operation member toward the rear of the housing, to the body, to thereby displace the hooking portions away from the mating housing. The operation member includes an operating portion for applying the force to the transmission portion. These portions are each formed with a flat surface inclined in a manner approaching the housing as it extends toward the rear of the housing.