A connector fittable to a partner connector , comprising: a housing ; a contact attached to the housing ; and a conductive shell attached to the housing , wherein the conductive shell includes at least a metal shell formed from a single metal plate, the metal shell includes a cover portion configured to cover at least part of a side portion outer peripheral surface of the housing , an elastic arm having a free end on a side configured to be fitted to the partner connector , and a support portion provided on a lateral side of the elastic arm to elastically connect the elastic arm to the cover portion and configured to support the elastic arm in a cantilever manner, the cover portion and the elastic arm have substantially opposing surfaces to each other, and the elastic arm has a lock portion configured to lock fitting between the connector and the partner connector at a position closer to a free end of the elastic arm than the support portion , wherein the housing includes a body portion and a fitting target portion extending from the body portion to the side configured to be fitted to the partner connector , wherein a radial dimension of a side portion outer peripheral surface (23 D) of the fitting target portion along a circumferential direction of the housing is set smaller than a radial dimension of a side portion outer peripheral surface of the body portion along a circumferential direction of the housing , wherein at least part of the free end side of the elastic arm having the lock portion is provided at a position closer to the fitting target portion than the support portion in a direction wherein the radial direction is a direction of displacement of the elastic arm , characterized in that the conductive shell further has a second shell configured to cover at least part of the outer peripheral surface of the fitting target portion , and at least part of the free end side of the elastic arm is arranged between the second shell and the housing . a housing ; a contact attached to the housing ; and a conductive shell attached to the housing , wherein the conductive shell includes at least a metal shell formed from a single metal plate, the metal shell includes a cover portion configured to cover at least part of a side portion outer peripheral surface of the housing , an elastic arm having a free end on a side configured to be fitted to the partner connector , and a support portion provided on a lateral side of the elastic arm to elastically connect the elastic arm to the cover portion and configured to support the elastic arm in a cantilever manner, the cover portion and the elastic arm have substantially opposing surfaces to each other, and the elastic arm has a lock portion configured to lock fitting between the connector and the partner connector at a position closer to a free end of the elastic arm than the support portion , wherein the housing includes a body portion and a fitting target portion extending from the body portion to the side configured to be fitted to the partner connector , wherein a radial dimension of a side portion outer peripheral surface (23 D) of the fitting target portion along a circumferential direction of the housing is set smaller than a radial dimension of a side portion outer peripheral surface of the body portion along a circumferential direction of the housing , wherein at least part of the free end side of the elastic arm having the lock portion is provided at a position closer to the fitting target portion than the support portion in a direction wherein the radial direction is a direction of displacement of the elastic arm , characterized in that the conductive shell further has a second shell configured to cover at least part of the outer peripheral surface of the fitting target portion , and at least part of the free end side of the elastic arm is arranged between the second shell and the housing . <EOS>