FIXING DEVICE

To provide a fixing device that can maintain the constant alignment between a fixing film and a pressure roller with a simple configuration.SOLUTION: A pair of first lateral plate 115d and second lateral plate 115e are supported by three stays (115a, 115b, 115c) so that the lateral plates face each other with an interval in a width direction. The three stays (115a, 115b, 115c) are arranged at three places in total: two places on the upstream and downstream sides in a recording material conveyance direction on a fixing film 100 side; and one place on the upstream side in the recording material conveyance direction on a pressure roller 101 side to support the first lateral plate 115d and the second lateral plate 115e. With such a simple configuration to support the first lateral plate 115d and the second lateral plate 115e at three places, deformation including bending and twist of the first lateral plate 115d and the second lateral plate 115e hardly occurs in association with pressing performed by pressure mechanisms (118A, 118B).SELECTED DRAWING: Figure 2 【課題】簡易な構成によって、定着フィルムと加圧ローラとのアライメントを一定に保つことができる定着装置の提供。【解決手段】一対の第１側板１１５ｄと第２側板１１５ｅとが３本のステイ（１１５ａ、１１５ｂ、１１５ｃ）により、幅方向において間隔を空け互いに対向するように支持される。これら３本のステイ（１１５ａ、１１５ｂ、１１５ｃ）は、定着フィルム１００側において記録材搬送方向の上下流の２か所と、加圧ローラ１０１側において記録材搬送方向の上流の１か所の計３か所に配置されて、第１側板１１５ｄと第２側板１１５ｅを支持している。こうした第１側板１１５ｄと第２側板１１５ｅと３か所で支持する簡易な構成により、加圧機構（１１８Ａ、１１８Ｂ）による押圧に伴い第１側板１１５ｄと第２側板１１５ｅに撓みや捩れなどの変形が生じ難くなる。【選択図】図２