A fixing apparatus according to an embodiment includes: a first roller; a second roller that forms a nip between the second roller and the first roller and presses a sheet passing through the nip against the first roller; a heater that heats at least one of the first roller and the second roller, a heating range of the heater being greater than a maximum printing width of a predetermined maximum sheet width, and a heat-uniformizing member that distributes heat of the heater along a longitudinal direction thereof, an effective length of the heat-uniformizing member in the longitudinal direction being the same as, or greater than, the predetermined maximum sheet width.