In a connector including a to-be-fitted portion for fitting to a mating connector in a first direction and a conductive shell covering the to-be-fitted portion, the shell is provided with a flange extending from a shell body in a second direction crossing the first direction and with a to-be-locked portion extending from the flange in the first direction. When attaching the connector to an attaching object, the flange is caused to face one surface of the attaching object in the first direction and the to-be-locked portion is caused to pass through the attaching object in the first direction so as to project from an opposite surface of the attaching object.