An electrical connector comprising: an outer cylindrical body having a mounting flange extending thereof having a screw hole, a cylindrical body arranged in the outer cylindrical body, wherein the cylindrical body including at least two latching protrusions and a lance, said latching protrusions protruding from an inner circumferential face of the cylindrical body in a radial direction of the cylindrical body, said lance extending in an axial direction of the cylindrical body in an inclined state relative to the inner circumferential face, said latching protrusions being situated at a position shifted from that of the lance in the axial direction, wherein the cylindrical body comprises: a terminal disposed in the cylindrical body, wherein the terminal houses in an independent terminal housing space, said terminal including a holding section at a middle portion thereof in the axial direction, said holding section including a first face contacting with the latching protrusions and a second face contacting with the lance, characterized in that the latching protrusions are provided in the middle of the cylindrical body and divide the terminal housing space into a front space and a rear space, wherein the cylindrical body is further comprising at least two protruding thin sections which extend in a front-and-back direction in the front space of the terminal housing space, wherein the protruding thin sections are arranged in the circumferential direction, wherein the protruding thin sections are respectively provided at the same position as the at least two latching protrusions, wherein the latching protrusions are positioned between the lance and the protruding thin sections, and wherein the latching protrusions are arranged such that their inner faces in the radial direction are forming an arch on one circle. an outer cylindrical body having a mounting flange extending thereof having a screw hole, a cylindrical body arranged in the outer cylindrical body, wherein the cylindrical body including at least two latching protrusions and a lance, said latching protrusions protruding from an inner circumferential face of the cylindrical body in a radial direction of the cylindrical body, said lance extending in an axial direction of the cylindrical body in an inclined state relative to the inner circumferential face, said latching protrusions being situated at a position shifted from that of the lance in the axial direction, wherein the cylindrical body comprises: a terminal disposed in the cylindrical body, wherein the terminal houses in an independent terminal housing space, said terminal including a holding section at a middle portion thereof in the axial direction, said holding section including a first face contacting with the latching protrusions and a second face contacting with the lance, characterized in that the latching protrusions are provided in the middle of the cylindrical body and divide the terminal housing space into a front space and a rear space, wherein the cylindrical body is further comprising at least two protruding thin sections which extend in a front-and-back direction in the front space of the terminal housing space, wherein the protruding thin sections are arranged in the circumferential direction, wherein the protruding thin sections are respectively provided at the same position as the at least two latching protrusions, wherein the latching protrusions are positioned between the lance and the protruding thin sections, and wherein the latching protrusions are arranged such that their inner faces in the radial direction are forming an arch on one circle. a terminal disposed in the cylindrical body, wherein the terminal houses in an independent terminal housing space, said terminal including a holding section at a middle portion thereof in the axial direction, said holding section including a first face contacting with the latching protrusions and a second face contacting with the lance, characterized in that the latching protrusions are provided in the middle of the cylindrical body and divide the terminal housing space into a front space and a rear space, wherein the cylindrical body is further comprising at least two protruding thin sections which extend in a front-and-back direction in the front space of the terminal housing space, wherein the protruding thin sections are arranged in the circumferential direction, wherein the protruding thin sections are respectively provided at the same position as the at least two latching protrusions, wherein the latching protrusions are positioned between the lance and the protruding thin sections, and wherein the latching protrusions are arranged such that their inner faces in the radial direction are forming an arch on one circle.