An image forming apparatus includes the following. A medium oscillating mechanism oscillates the recording medium. A medium sensing section senses a position of an end of the recording medium. A belt correction mechanism is configured to correct a position of a belt. A belt sensing section senses the position of the end of the belt. A hardware processor performs first rectification control in which the medium oscillating mechanism rectifies the position of the end of the recording medium based on sensing by the medium sensing section, and second rectification control in which the belt correction mechanism rectifies the position of the end of the belt based on sensing by the belt sensing section. The hardware processor performs a correction to the second rectification control in a case in which the first rectification control is performed with the recording medium straddling both the medium oscillating mechanism and the belt.

A sheet guide device includes a transport guide section that has a guide surface that, by allowing a sheet that is transported to pass, guides the sheet toward a transport destination; and an auxiliary member that is chargeable, that is attached to the guide surface, and that assists in guiding the sheet, in which the auxiliary member includes multiple narrow-width portions existing side by side in a width direction that intersects a transport direction of the sheet and each having a shape whose width becomes narrower in the transport direction.