An AD adapter module including an AD adapter device, a socket, shielding case and a supporting part. The socket has a lateral side with a side protrusion on the lateral side, and is installed on the AD adapter device. The shielding case has a hole penetrating through the shielding case. The AD adapter device is disposed within the shielding case with the lateral side and side protrusion of the socket exposed from the hole. The supporting part has a securing protrusion and is disposed on the shielding case. The securing protrusion penetrates through the hole of the shielding case so the securing protrusion makes contact with the side protrusion and the shielding case. When a plug is inserted into the socket, the securing protrusion of the supporting part is pushed against the side protrusion of the socket.