A fixing device includes a belt member that performs a circular motion by rotating in a predetermined belt rotation direction; a pressure-applying member that is pressed against an outer peripheral surface of the belt member and applies a pressure to a recording medium on which an image is formed; and a pressing member that extends in a belt width direction, which is a direction that crosses the belt rotation direction, inside the belt member and that is arranged so as to be deformed such that a central portion thereof in the belt width direction is convex toward an upstream side in the belt rotation direction, the pressing member pressing the pressure-applying member with the belt member interposed therebetween.