Image forming apparatus that suppresses temperature rise in developing device

An image forming apparatus includes: an image carrier; a developing device; a transfer section; a fixing section; a conveyance path through which a recording sheet is conveyed; an air path guiding air taken from an outside of the apparatus to the conveyance path and the developing device; an adjustment member arranged at an outlet port of the air path, branching the air flowing through the air path into directions toward the conveyance path and the developing device, and adjusting volume of the air flowing toward each direction; and a control section controlling the adjustment member in accordance with conveyance status of the recording sheet in the conveyance path, and when no recording sheet exists in the conveyance path, causing the adjustment member to branch the air flowing through the air path so that more air flows toward the developing device than the conveyance path.