A making it possible to firmly maintain the fitting state of the electrical connectors. The A resilient arm member 23d provided on the conductive shell member to elastically displaced in a direction perpendicular to the fitting direction of the mating connector, the connector abutment surface mating connector faces the back of the fitting direction 23e1 When the engaging piece 23e having a shell contact surface 23e2 which part of the conductive shell member to face the front of the fitting direction is provided, opposite to the direction of the fitting direction relative to the mating connector in a fitted state when an external force in the removing direction is added is, as a state of sandwiching the locking piece 23e between the mating connector and the conductive shell member, such as leading to unlock unplugged locking piece 23e from the mating connector it is those having the arrangement to avoid a situation. .The 24