A fixing device having: a fixing member extending in a first predetermined direction; a heating roller extending in the first predetermined direction; a fixing belt stretched between the fixing member and the heating roller and being annular when viewed in a plan view in the first predetermined direction; a heating section heating the heating roller and being provided in the heating roller; a first support section supporting the heating roller in such a manner that the heating roller is movable with respect to the fixing member along a predetermined plane perpendicular to the first predetermined direction; a pressure section exerting a force upon the heating roller in such a direction that the heating roller moves away from the fixing member; and a second support section supporting the heating section in such a manner that the heating section is movable together with the heating roller.