To provide an optical transceiver with a lock mechanism having a simplified lock mechanism member.

Formed as an integration parts are an actuator portion 7 engaging a movable lock member 5 with a lock hole 4 during a backward stroke and disengaging the movable lock member 5 from the lock hole 4 during a forward stroke, and a lever portion 9 formed to freely rotate forward from a front-end upper portion of a housing 2 and serving as a handle for placing the actuator portion 7 in forward stroke operation when the actuator rotates forward.