In a fixing device for fixing a toner image to a recording medium by heating and pressing the recording medium with transferred toner image between a heat fixing member and a pressure member, a fixing-member housing is disposed on an outer peripheral side of the heat fixing member, while a reflection member is attached to an inner side of the fixing-member housing opposed to the heat fixing member. Air blown by an air blower is circulated through space between the fixing-member housing and the heat fixing member.