Cap and electrical connector with cap

A cap mounted to an electrical connector which is mounted on a mounting face of a circuit board and is matingly connectable to a counterpart connector such that a direction perpendicular to the mounting face is the direction of mating, the cap comprising:

• a cover plate portion that extends in a longitudinal direction of the electrical connector parallel to the mounting face and covers the electrical connector from a mating side in the direction of mating, and
• attachment pieces and support pieces that extend from opposite ends of the cover plate portion in the longitudinal direction toward the mounting face side in the direction of mating and that are resiliently displaceable in the longitudinal direction, wherein:
• the attachment pieces extend along outer surfaces of end walls provided at opposite ends of a housing of the electrical connector in the longitudinal direction, and are attachable to the outer surfaces of the end walls, and
• the support pieces extend along inner surfaces of the end walls and are capable of supporting the inner surfaces.