An electric apparatus module 1 includes an upper casing 6, a lower casing 7 to which the upper casing 6 is attached and which is attached to a rear panel 2, an electronic device unit 8 accommodated in the upper casing 6 and the lower casing 7, a conductive shield shell 9 covering the electronic device unit 8, and a conductive ground shell 10 which is attached to the lower casing 7 at a side of the rear panel 2. The ground shell 10 includes a flat plate portion 83 piled on the rear panel 2, a contact piece 84 erected from an outer edge 83c of the flat plate portion 83 toward the lower case 7, and a contact member 85 protruded from a rear surface 83b of the flat plate portion 83 at the side of the rear panel 2. The contact piece 84 is inserted through a through hole 56 formed on the lower casing 7 to contact with the shield shell 9. The contact member 85 is inserted through a through hole 11 formed on the rear panel 2 to contact a cylindrical shield member 22 of an external device.