The connection state of contact members with respect to a wiring board can be easily visually checked by a simple configuration. A shield wall portion composed of an electrically-conductive member opposed to contact connecting portions (board connecting portions) of a plurality of contact members arranged in a multipolar shape is provided; each of ground connecting portions provided in the shield wall portion is disposed at the part between the contact connecting portions, which are adjacent to each other; a lateral check window composed of the space which enables visual check of the contact connecting portions is formed in the interval region in which the ground connecting portions are adjacent to each other; an electromagnetic shielding function with respect to the contact connecting portions is obtained by the shield wall portion; and, at the same time, the connection state of the contact connecting portions with respect to the wiring board can be visually checked through the lateral check window provided in the shield wall portion.