To provide an exhaust gas purification device and method in which a DPF and a denitration device can be combined compactly by solving the problem accompanied by the combination of the DPF and the denitration device with a DE exhaust gas treating device, without causing enlargement, complication and cost increase of the device.

The exhaust gas purification device is comprised of a filter device 10 in which a pair of a porous corrugated sheet and a porous flat sheet supporting an exhaust gas purification catalyst are made as a base unit, the porous corrugated sheets are piled up so that the ridges of the corrugated sheets intersect each other, two surfaces adjoining each other of a rectangular side face are closed, and an inflow passage and an outflow passage of the exhaust gas are formed between the corrugated sheets via the flat sheets, a bypass passage 11 to purge the deposit of the filter device with the exhaust gas by opening the closed surface, and the exhaust gas treating device having change-over valves 4, 7 to select either the exhaust gas passage 12 or the bypass passage 11 of the filter device 10, the denitration device 5, and the exhaust gas denitration device 5 installed in slipstream of an exhaust gas outflow passage 12 of the filter device 10.

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