This fitting structure for a conductive sheet comprises: a conductive member 10 which is arranged within a predetermined region in a front case 61 of an electronic device that has the front case 61 and a rear case 62, said cases being first and second case pieces that are separably joined to each other, and which is electrically connected to ground patterns SG, FG of the electronic device; and a conductive sheet 20 which is arranged within the rear case 62 so as to face the predetermined region of the front case 61 and comprises a conductive layer 21. In a state where the front case 61 and the rear case 62 are joined with each other, the conductive layer 21 of the conductive sheet 20 is in contact with the conductive member 10 and is electrically connected to the ground patterns SG, FG of the electronic device.