To reproduce a filter by reacting and extinguishing a particulate substance scavenged by the filter by using plasma energy in this DPF device.

This DPF device reproduces the filter 3 by reacting and extinguishing the particulate substance scavenged by the filter 3 by the plasma energy generated between wire nets 4 and 6. A controller 10 controls plasma power of a plasma generator according to information on an engine operating state detected by a rotation sensor 18 and a load sensor 19, and controls so as to react and extinguish the particulate substance scavenged by the filter 3. The controller 10 controls the plasma power generated by the plasma generator in response to a scavenging quantity or more of the particulate substance predetermined by a timer or pressure sensors 9 and 11.