A processing target reforming apparatus includes: a conveying unit that conveys a processing target along a conveyance path; a discharge unit including a plurality of discharge electrodes aligned along the conveyance path, a counter electrode with the conveyance path interposed therebetween, and a power source that applies a voltage waveform to the discharge electrodes; and a control unit that controls the discharge unit such that a phase of the voltage waveform applied to a first discharge electrode of the discharge electrodes at a timing when a certain point of the processing target passes between the first discharge electrode and the counter electrode is shifted with respect to a phase of the voltage waveform applied by the power source to a second discharge electrode of the discharge electrodes at a timing when the certain point of the processing target passes between the second discharge electrode and the counter electrode.