The present invention discloses an image processor, in which an inverter for driving a fluorescent lamp is disposed in separation into parts at both ends of a carriage mounting the fluorescent lamp thereon in a direction perpendicular to a scanning direction of the carriage, so as to shorten a harness between the fluorescent lamp and the inverter and dispense with a part projecting in the scanning direction of the carriage, thereby achieving miniaturization. Inverters for driving a fluorescent lamp are disposed in appropriate separation at both ends of a full-rate carriage mounting the fluorescent lamp thereon in a scanning direction of the full-rate carriage and does not project in the scanning direction of the full-rate carriage. Thus, it is unnecessary to provide space in a casing for accommodating a projecting inverter in the case at a scanning ending end, thereby allowing miniaturizing the casing.