A liquid cartridge which is used and is in the empty state is attached to the second cartridge attaching unit. When the attachment detector has detected that the liquid cartridge is attached to the second cartridge attaching unit and the second empty detector has detected that the liquid cartridge is in an empty state, the control unit controls the pump in such a way that a predetermined conveyance amount of the liquid is conveyed to the liquid cartridge attached to the second cartridge attaching unit after the liquid is conveyed from the discharge path to the liquid cartridge until the second empty detector detects that the liquid cartridge is no longer in the empty state.