An electronic device includes: an electronic part; an external case that covers the electronic part and constitutes an exterior; and a heat dissipation frame that transmits heat generated from the electronic part to the external case. The external case includes a top case, a front case, and a rear case, while the heat dissipation frame includes a first heat dissipation frame, a second heat dissipation frame, and a third heat dissipation frame provided independently from each other. Mechanical fixation is made to combine the top case and the first heat dissipation frame into one body, to combine the front case and the second heat dissipation frame into one body, and to combine the rear case and the third heat dissipation frame into one body.