An imaging apparatus has an image carrier, an exposure unit to irradiate the image carrier; a developing part; a rotator on which a plurality of such developing parts is provided; a color toner replenishing part which moves from a retracted position where light emitted from the exposure unit is not obstructed, to a replenishing position where light emitted from the exposure unit is obstructed, and with which the color toner of the color developing part in the replenishing position is replenished; and a black toner replenishing part which is disposed in a position where light emitted from the exposure unit is not obstructed and with which the black toner is replenished to the black developing part in the replenishing position.