To provide the heat radiation structure of an electronic device, which is improved in the discharging efficiency of the heat generated by the electrical devices.

The heat radiation structure of the electronic device is constituted of a heat radiation unit 7, in which a plurality of heat radiation holes 7a are arranged in pairs of left and right rows while the heat radiation hole 7a is constituted of a front inflated part 9a whose upper spherical part is inflated forward, a rear inflated part 9b whose lower spherical part is inflated rearward, and a hole 9c formed between the inflated parts 9a, 9b. The area of the heat discharging hole 9c is increased double compared with a conventional hole, and an electrical component unit as well as an imaging unit can be sufficiently cooled.