To avoid clogging of a catalyst reclaimed type particulate filter more surely than conventionally.

In the exhaust gas purifying device, equipped with the catalyst reclaimed type particulate filter arranged midway along an exhaust pipe 4 with which the exhaust gas 3 from a diesel engine 1 communicates, the particulate exhaust pipe 10 is connected to the upper stream side of the particulate filter 5 via a passage selecting valve 9, small size particulate filter 12 with a heater 11 is equipped at the end part of the particulate exhaust pipe 10, a bypass exhaust pipe 14 is connected to farther upper stream side of the passage selecting valve 9 via a passage selecting valve 13, a passage-blocking valve 15 is installed at the lower stream of the particulate filter 5, and an air tank 17 is connected between the valve 15 and the particulate filter 5 so as to induce backwash air 18.