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.