An electronic device including a slot unit to which a memory medium is inserted. The electronic device is able to read out image data from the memory medium inserted to the slot unit. The slot unit includes a panel mounted to the front of the electronic device where the panel has a surface swelled toward the front side of the electronic device. The slot unit further includes a memory medium accommodating portion provided in the panel which on the swelled surface has an opening to which the memory medium is inserted. A mark representing the type of the memory medium to be inserted into the opening is provided at a position of the swelled surface corresponding to the upper side of the opening.