10 m 10 y 10 k respectively the transfer units 30 c 30 m 30 y 30 k respectively transcribe the developed image from the surface of each of the photosensitive bodies 10 c 10 m 10 y 10 k onto the transfer medium 50 more specifically the transfer units 30 c 30 m 30 y 30 k correspond to the 4 photosensitive bodies 10 c 10 m 10 y 10 k and different levels of power are supplied to the respective transfer units 30 c 30 m 30 y 30 k to transfer the respective developed color images from the surface of the photosensitive bodies 10 c 10 m 10 y 10 k onto the transfer medium 50 one after another i e sequentially the first transfer unit 30 c in the advancing direction of the transfer medium 50 has the least voltage level and the voltage level increases toward the last transfer unit 30 k which the highest level of voltage the developing units 20 c 20 m 20 y 20 k are disposed on the lower sides of the photosensitive bodies 10 c 10 m 10 y 10 k developing electrostatic latent images of the surfaces of the photosensitive bodies 10 c 10.