An electrical connector device includes a first connector including a first metal shell member; and a second connector to be mounted on a board and including a second metal shell member. The second connector includes an opening portion for receiving a fitting portion of the first connector in a fitting direction. The second metal shell member includes a ground connecting portion to be contacted with the board and a ground contacting member situated in a cut hole. The ground contacting member is arrange to be capable of contacting with the first metal shell member. The ground connecting portion is arranged partially on a first imaginary straight line perpendicular to the fitting direction and a second imaginary straight line in parallel to the fitting direction so that the cut hole is not situated on the first imaginary straight line and is situated partially on the second imaginary straight line.