An image forming device includes: a fixing unit fixing a toner image to a paper sheet after image formation; a conveying path conveying the paper sheet toward and from the fixing unit; a cooling fan disposed at a position facing the conveying path that is downstream relative to the fixing unit in a paper conveying direction; a casing where the cooling fan is accommodated; a first discharge port discharging cooling air from the cooling fan toward a part of the conveying path that is upstream in the paper conveying direction relative to an end portion of the conveying path in the conveying path, which is downstream relative to the fixing unit; and a duct guiding the cooling air from the cooling fan in a direction toward the end portion of the conveying path, which is different from a direction that the cooling air flows in the first discharge port.