An image forming apparatus is provided which includes a switching mechanism which selectively shifts developing rollers among an all-color non-contact state in which all photosensitive members are kept apart from the corresponding developing rollers, a black contact state in which only the photosensitive member for black is kept in contact with the corresponding developing roller, and an all-color contact state in which all the photosensitive members are kept in contact with the corresponding developing rollers, and a control section which, when an operation mode of the apparatus is shifted from a color mode to a monochrome mode, causes the switching mechanism to shift the developing rollers from the all-color contact state to the all-color non-contact state to perform a transferring process to once transfer developing agents from recovery members onto the corresponding photosensitive members and further transfer the developing agents from the photosensitive members onto a transfer belt.