A cable fixing mechanism has a guide member and a conductive member, and permits a flexible cable to be fixed that is formed in the shape of a strip with a plurality of conductive wires arranged parallel to one another inside a cover member. The guide member has a guide surface facing one face of the flexible cable, and is fixed to a frame made of metal. The conductive member is flexible, is fixed to the guide member to face the guide surface, and is in contact with the frame. By the restoring force of the conductive member elastically deformed when fixed to the guide member, the flexible cable is held between the conductive member and the guide surface.