An image forming apparatus includes a fixing unit, a housing having a sheet ejection opening, a plurality of sheet ejection rollers disposed in the sheet ejection opening and configured to eject the sheet fed from the fixing unit to the outside of the housing, a heat generating member spaced apart from the fixing unit and configured to generate heat, and a first guide member. The first guide member is disposed above the heat generating member, and configured to guide the sheet fed from the fixing unit to the ejection rollers. The first guide member includes a base portion having a plurality of outlet ports, and a plurality of ribs protruding upward from the base portion. The outlet ports are disposed between each pair of adjacent ones of the ribs and positioned closer to a downstream end of the first guide member than to an upstream end thereof.