An image forming apparatus includes first and second rotating members, a setting unit, and first and second image forming units. The first rotating member rotates at a first period T1. The second rotating member rotates at a second period T2. The setting unit sets the first period T1 and the second period T2 so that T1 and T2 meet a relation T2=(n+0.5)×T1 (n is a positive integer). The first image forming unit forms a first image on the second rotating member in an x-th rotation (x is a positive integer) using first data obtained from print data and using the first rotating member. The second image forming unit forms a second image on the second rotating member in an (x+y)-th rotation (y is an odd positive integer) using second data obtained from the print data and using the first rotating member.