A fixing device includes a heat assembly including an endless belt, a heat source, a pressure pad, and a cleaning member that cleans an inner surface of the endless belt as the result of circulation movement of the endless belt; and a pressure member that presses an outer surface of the endless belt. The cleaning member contacts the endless belt with a contact-pressure distribution such that a contact pressure of a portion located downstream of a most upstream portion in a moving direction of the endless belt is the maximum in a contact region where the cleaning member contacts the endless belt.