A complex connector, comprises a male connector composed of a first male connector and the second male connector formed integrally with each other; a first female connector to which a second female connector and a lock assistant are attached in a movable manner, wherein the lock assistant includes an elongated cantilever member extending toward the first male connector, and a projection retaining engagement with the engagement portion of the first female connector is formed at a distal end of the elongated cantilever member, and in a condition in which the first male connector and the first female connector are disengaged from each other, the projection is retainingly engaged with the engagement portion, and in a condition in which the projection is retainingly engaged with the engagement portion, the projecting portion of the second female connector abuts against the abutment portion of the lock assistant.