A connector provided with a half-fitting prevention function has a simplified configuration. A spring 40 is provided with a spring member 44 located to the posterior of a spring pressing member 41 which is pressed directly by a female housing. This spring member 44 is compressed when it receives a pressing force. The spring pressing member 41 and the spring member 44 are formed in a unified manner from plastic. The spring 40 is housed within a spring housing chamber 30 of a male housing 20. If the fitting of the two housings is halted part-way through the operation, the spring member 44 which has been compressed is released, the force which has been accumulated thus far is released, and the female housing is thereby caused to move in a direction of separation.