To purify exhaust gas by decomposing NOX by plasma energy by adsorbing the NOX in the exhaust gas by a compound having a Brownmillerite- like structure in this exhaust emission control device.

In this exhaust emission control device, the compound having the Brownmillerite-like structure is stuck to a filter body 5 for constituting a filter 3, a pair of wire nets 4 and 6 are respectively arranged on both sides of the filter body 5, the NOX in the exhaust gas is adsorbed to an oxygen deficiency part of the compound having the Brownmillerite-like structure, and is put in a radical state, the NOX of the radical state is decomposed and extinguished by the plasma energy, and nitration reaction of the compound having the Brownmillerite-like structure is prevented.