A connector comprising: a housing formed into a cylindrical shape; a terminal holding body holding a terminal fixed to a tip end portion of a cable in an axial direction, and disposed inside the housing ; a water-proof seal disposed inside the housing so as to face to a base end portion of the terminal holding body in the axial direction, and coming into tightly contact with an inner circumferential face of the housing ; and a cap fixed to the housing so as to face to a base end portion of the water-proof seal in the axial direction, and pressing the water-proof seal , the water-proof seal has a seal side through hole through which the cable passes, and a boss through hole formed in parallel to the seal side through hole , the cap has a cap side through hole through which the cable passes at a position corresponding to the seal side through hole , and one of the terminal holding body and the cap has a boss which is protruded from an opposite face facing to the water-proof seal toward the other of the terminal holding body and the cap , passes through the boss through hole and abuts on the other of the terminal holding body and the cap , characterized in that on an inner circumferential face of the cap side through hole , a plurality of contact projections are projected toward a center in a radial direction of the cap side through hole at positions separated at intervals in a circumferential direction of the cap side through hole , and tip end portions of the plurality of contact projections come into contact with an outer circumferential face of the cable disposed in the cap side through hole . a housing formed into a cylindrical shape; a terminal holding body holding a terminal fixed to a tip end portion of a cable in an axial direction, and disposed inside the housing ; a water-proof seal disposed inside the housing so as to face to a base end portion of the terminal holding body in the axial direction, and coming into tightly contact with an inner circumferential face of the housing ; and a cap fixed to the housing so as to face to a base end portion of the water-proof seal in the axial direction, and pressing the water-proof seal , the water-proof seal has a seal side through hole through which the cable passes, and a boss through hole formed in parallel to the seal side through hole , the cap has a cap side through hole through which the cable passes at a position corresponding to the seal side through hole , and one of the terminal holding body and the cap has a boss which is protruded from an opposite face facing to the water-proof seal toward the other of the terminal holding body and the cap , passes through the boss through hole and abuts on the other of the terminal holding body and the cap , characterized in that on an inner circumferential face of the cap side through hole , a plurality of contact projections are projected toward a center in a radial direction of the cap side through hole at positions separated at intervals in a circumferential direction of the cap side through hole , and tip end portions of the plurality of contact projections come into contact with an outer circumferential face of the cable disposed in the cap side through hole . <EOS>