A fixing apparatus includes a flexible rotary member, a pressure roller, a heating element, a regulation member configured to regulate movement of the flexible rotary member by abutting against one end portion of the flexible rotary member in the axial direction, a guide unit, and an interlocking portion. The interlocking portion includes a hole portion and a shaft portion engages with the hole portion, and wherein an axis of the shaft portion is parallel to the axial direction of the flexible rotary member. The interlocking portion configured to move the guide unit in the conveyance direction in accordance with movement of the regulation member in the conveyance direction so that a clearance is kept between the guide unit and the flexible rotary member in the conveyance direction.