An image forming apparatus includes scanning targets, an optical scanning section, a cassette, a cassette insertion section, and a cassette guide. The optical scanning section scans the scanning targets with light. The cassette guide is disposed in the cassette insertion section and guides the cassette. The optical scanning section includes a plurality of reflecting members corresponding one-to-one with the scanning targets. Each reflecting member directs the light to a corresponding one of the scanning targets. The cassette guide includes one or more adjustment mechanisms that are equal in number to a prescribed number of reflecting members out of the plurality of reflecting members. The prescribed number of adjustment mechanisms correspond one-to-one with the prescribed number of reflecting members. Each adjustment mechanism adjusts a position of a corresponding one of the reflecting members.