In the present invention, in order to efficiently cool circuit boards such as an image formation section (20) and a power source board (71) accommodated in a main body housing (60), the power source board (71) and a cooling fan (100) are attached to a lateral wall part (62a) adjacent to the image formation section (20) in the main body housing (60), and the cooling fan (100) cools the image formation section (20) and the power source board (71) by utilizing air flow generated by rotation.