A fixing device includes a heating member that has a heat source, comes into contact with a surface of a continuous medium having an image transferred thereto and heats the surface; a pressure member that is provided so as to oppose the heating member with the medium therebetween and applies pressure to the medium; and a tensioning member that is provided on a downstream side of a fixing area, where the heating member and the pressure member oppose each other, in a medium-transport direction, applies tension to the medium by pressing the medium toward the pressure member, and wraps the medium around the pressure member.