Abstract: For providing a connector device in which the combinational precision of a guide mechanism and a lock mechanism can be easily increased and it can be easily confirmed whether or not the engagement of the connector device and lock is effectively performed, a guide pin is provided to a male connector and a guide bore is provided to a female connector and they guide an engaging operation between the male connector and the female connector. The guide bore is provided therein with a retractable lock piece with a permanent magnet. An electromagnet provided at the lower portion of the lock piece is polar exchanged in response to a signal input from outside so that the lock piece is engaged with the guide pin or is disengaged from the guide pin to perform a lock/unlock operation. The position of the lock piece is detected to recognize the engaging or locking state of the connectors.