An image forming apparatus includes an image forming portion, a rotatable endless belt, a plurality of stretching rollers including an inner roller and an upstream roller; an outer member, a pressing member, a moving mechanism; and a control portion. The moving mechanism is capable of changing a pressing amount of the pressing member to the belt or a contacting and separating state of the pressing member to the belt by changing a position of the pressing member. The control portion controls magnification of a toner image, to be formed on the belt by the image forming portion, with respect to a conveyance direction of the belt based on a position of the pressing member by the moving mechanism while the toner image is transferred to the recording material from the belt.

An image forming apparatus includes an image forming portion, a rotatable endless belt, a plurality of stretching rollers including an inner roller and an upstream roller; an outer member, a pressing member, a moving mechanism; and a control portion. The moving mechanism is capable of changing a pressing amount of the pressing member to the belt or a contacting and separating state of the pressing member to the belt by changing a position of the pressing member. The control portion controls magnification of a toner image, to be formed on the belt by the image forming portion, with respect to a conveyance direction of the belt based on a position of the pressing member by the moving mechanism while the toner image is transferred to the recording material from the belt.

An apparatus includes a movable regulation member that regulates a trailing edge side position of a sheet stack stored in a storage portion in a sheet feeding direction, a trailing edge detection portion, movable together with the regulation member, that detects a sheet surface on the trailing edge side of the sheet stack, and a control unit that detects whether the regulation member is positioned to an end surface on the trailing edge side of the sheet stack based on a detection result by the trailing edge detection portion, and that causes a display unit to provide a warning if the regulation member is not positioned to the end surface, wherein, if a predetermined sheet with thicknesses different between leading edge and trailing edge sides thereof in the sheet feeding direction is set by a setting unit, the control unit does not cause the display unit to provide the warning.