In an electronic device, a substrate mounting unit is provided at a front side inside a housing, and contains a plurality of electronic substrates under a state where faces of any two mutually adjacent ones of the plurality of electronic substrates are opposite to each other. A power supply unit is provided at a position which is located at a rear side inside the housing and is located behind the substrate mounting unit, and supplies the plurality of electronic substrates with electric power. A power-supply fan unit, which is provided at a rear side of the power supply unit, takes in air outside the housing from the power-supply air intake opening, and discharges the taken-in air to an outside of a rear side of the housing via the substrate mounting unit and the power supply unit.