IMAGE FORMING DEVICE

PURPOSE:To execute copying continuously for a long period without supplying a toner on the way by enlarging the toner accommodating capacity of a special developing device more than other device. CONSTITUTION:By plural photosensitive drums 31, 41, 51 and 61 to form respectively static latent images classified by the color component of and original image and respective developing devices 33, 43, 53 and 63 arranged respectively, the development is executed to the visible image, and to a paper 70 to shift along the photosensitive body, the visible image is successively transferred by one rotation. At such a time, since a photosensitive body 30 for a black color and the toner accommodating capacity of the developing device 33 are made larger than others, even when the difference exists at the consumption between toners, the copying can be executed without supplying the toner for a long period.