In an Image forming apparatus, a light color toner image forming unit that forms a light color toner image on a transfer medium has a first developing device which develops an electrostatic image on a first image bearing member to form the light color toner image on the first image bearing member. A first transfer member electrostatically transfers the light color toner image to the transferring medium member by abutting against the first image bearing member with the transferring member in a first abutting position. A deep color toner image forming unit that forms a deep color toner image on a transferring medium has a second developing device which develops an electrostatic image on a second image bearing member in a second developing portion to form the deep color image on the second image bearing member. A second transferring member electrostatically transfers the deep color toner image to the transferring medium by abutting against the second image bearing member with the transferring member arranged so that the rotational direction distance of the first image bearing member between the second developing potion and the second abutting portion is longer than the rotational direction distance of the first image bearing member between the first developing portion and the first abutting potion and so that the deep color toner image forming unit is arranged upstream of the transferring medium moving direction with respect to the light color toner image forming unit.