A connector includes a housing formed with a plurality of terminal insertion holes into which a plurality of terminal metal fittings is inserted, respectively, and a spacer arranged inside the housing and coating the plurality of terminal metal fittings. The spacer includes main bodies fixed inside the housing, and a plurality of slit doors provided in the main bodies and divided into a plurality of small pieces by a plurality of slits. Each of the slit doors elastically deforms by abutting a terminal metal fitting inserted into a terminal insertion hole when the terminal metal fitting passes therethrough, and is brought into contact with the terminal metal fitting when the terminal metal fitting is attached to the housing.