To suppress the occurrence of an insufficient image density resulting from the adhesion of toner to locations around holes on a surface of a circuit board.

When not forming an image based on image information, in a toner carrying sleeve 30Y, while a repetitive pulse voltage which repeats rise and fall at predetermined intervals is applied to one of a first electrode to which an A-phase voltage for hopping is applied and a second electrode to which a B-phase voltage is applied, a constant voltage having the same value as the central value of the repetitive pulse voltage is applied to the another. Simultaneously. an entry voltage having a value capable of allowing hopping toner to enter through-holes 14Y and an inhibition voltage having a value capable of inhibiting hopping toner from entering the through-holes 14Y are alternately applied to electrodes 12Y in proximity to the through-holes, thereby performing a toner particle removal promoting process for promoting removal of toner adhering to locations around the through-holes 14Y of the circuit board 1.