To regenerate a trap filter efficiently by increasing a combustion efficiency in regenerating the trap filter.

A regenerative device is provided with a heating device for filter regeneration which removes by combustion particulates which are captured by a trap filter 1 installed in the exhaust path 5 of a diesel engine and an air introducing means 9 which leads combustion supporting air into the upstream side of the filter 1 in the regeneration of the trap filter 1. Also a nitrogen adsorber 13 in which zeolite to adsorb nitrogen in the combustion supporting air is filled is installed, and a pressurizing means to pressurize the combustion supporting air to be led into a nitrogen adsorber 13 is installed.