To provide, at a low cost, a diesel exhaust gas processing device in which a ceramic filter is used, particulate matters collecting efficiency and durability are enhanced.

A device body 5 is formed such that an opposite side opening of both openings is alternately sealed with a ceramic member 7 at every adjacent cell 6 in a honeycomb structure body of porous ceramics, an exhaust gas (arrow) flowing in one of the cells 6 passes through a filter part 8 constituted of a porous honeycomb wall, enters another cell 6 adjacent to the one of the cell 6, and flows out from a side B opposite to a gas inflow side A. A heat resistance fiber 10 is installed inside a cell 6-1 which opens to the inflow side A, and an oxidation catalyst (not shown) is carried by the filter part 8 (honeycomb wall) and the heat resistance fiber 10.