A developing apparatus is disclosed which is disposed opposite to an electrostatic latent image holding member and adapted for developing an electrostatic latent image formed on the electrostatic latent image holding member to a visible image with a single component toner, the apparatus comprising a first toner carrier having a peripheral surface and being adapted for holding the single component toner on the peripheral surface, a first regulating member which is in contact with the first toner carrier, a second toner carrier having a peripheral surface and being adapted for holding the single component toner and for relatively approaching to or coming in contact with the first toner carrier so as to transfer the single component toner to the first toner carrier, and a second regulating member which is in contact with the second toner carrier, wherein the first toner carrier or the second toner carrier is adapted to relatively and selectively approach to or come in contact with the electrostatic latent image holding member and transfer to the electrostatic latent image holding member either a single component toner held on the peripheral surface of the first toner carrier or a single component toner which resides on the peripheral surface of the second toner carrier after the single component toner has been transferred from the second toner carrier to the first toner carrier so as to develop the electrostatic latent image to the visible image with the single component toner.