An image forming apparatus includes an image bearing member, first toner image forming device of forming a first toner image by a first toner, second toner image forming device of forming a second toner image by a second toner, transferring device of transferring the first toner image on the image bearing member to a transferring medium, and electrostatically transferring the second toner image on the image bearing device so as to be overlaid on at least a portion of the first toner image transferred to the transferring medium, fixing device of mixing and fixing at least the first and second toner images on the transferring medium, and forming the mixed toner images on the transferring medium, detecting device of detecting the mixed toner images at least on the transferring device, and control device of variably controlling the transferring condition of the transferring device based on the detection result of the mixed toner images at least on the transferring medium of the detecting device. In this manner, a color taste of toner can be adjusted.