A shield is made of a conductive material and used to cover a connector fixed to a circuit board. The shield includes a shield body, a contact portion and a lock portion. The shield body covers an outside of the connector. The contact portion projects from the shield body toward inside of the shield body to contact a ground terminal of the connector. The contact portion is elastically deformable and applies a pressing force toward the connector. The lock portion projects from the shield body toward outside of the shield body. The lock portion is brought into contact with the connector by a reaction force exerted to the shield body due to the pressing force, thereby to restrict the shield body from being moved relative to the connector due to the reaction force.