Locking device of connectors

The object of the present invention is to provide a locking device of connector which can be manufactured less expensively and can engage with a base connector more reliably, particularly adapted to employment in high-voltage connectors of a reduced height. To achieve the object, the device comprises a socket connector (1) having a socket housing (2) in which socket contacts (12) secured on wire ends (11) are placed side by side; and a base connector (21) mounted on a printed circuit board (20). A pair of lock arms (6), (6) is extended forwards from a rear end of the socket housing (2) and along lateral sides (4), (4) of the socket housing (2), which is integrally formed on the two lateral sides (4), (4) of the socket housing (2) by tie pieces (5), (5) capable of elastic deformation. The lock arms (6) have fore ends formed integral with hooks (7) projecting inwards, and the lock arms (6) further have push lugs (8) extending backwards from their rear ends so as to be located in rear of the tie pieces (5). When engaging the connectors one with the other, the lock arms (6), (6) will be guided forwards along respective sides (25), (25) of the base housing (22) of the base connector (21) until latched in place, the hooks (7), (7) is engaged in the rear edge (27), (27) of the base housing (22).