A fixing device including a heating member, a pressing member that presses the heating member, a switching unit that switches a press contact force of the pressing member and a container body that accommodates the heating member, the pressing member, and the switching unit, wherein the switching unit, includes a drive member that moves the pressing member in a predetermined direction and an auxiliary drive member that is connected to the drive member and relatively moves with the drive member, and the auxiliary drive member, in a case where the container body is placed in an image forming apparatus including a lid, switches between a operative association state and a nonoperative association state, and the auxiliary drive member including a returning section that returns a tip of the auxiliary drive member to a position crossing a movement trajectory of the lid in the nonoperative association state.