A waterproof connector has a deformation space (35) for a locking lance (30) that opens in the front surface of a housing (10). A wall surface (41) of a base end part of the locking lance (30) is located at a back side of the deformation space (35). In the process of inserting a terminal fitting (90) into a cavity (26), the locking lance (30) is resiliently deformed toward the deformation space (35) with a base end thereof as a support. When the terminal fitting (90) is inserted properly into the cavity (26), the locking lance (30) resiliently returns to retain the terminal fitting (90) in the cavity (26). A recess (42) is formed in the wall surface (41) of the base end portion of the locking lance (30).