A probe for characteristic inspection of a connector includes a plunger, a coaxial cable, a flange, and a housing having an end portion on one side including an increased diameter portion. A recessed portion which receives the increased diameter portion is in an upper surface of the flange. The increased diameter portion has side walls in contact with or facing respective inner side surfaces of the flange partly, with the inner side surfaces forming the recessed portion, and a bottom wall in contact with an upper recessed surface of the flange that forms the recessed portion. The increased diameter portion has connection surfaces connecting the bottom and side walls and inclined inward from one of the side walls toward the bottom wall. Alternatively, the inner side surfaces each have a first surface inclined downward, and a vertical surface extending downward from the first surface to the upper recessed surface.