EXHAUST GAS CLEANING FILTER

PROBLEM TO BE SOLVED: To provide an exhaust gas cleaning filter including an Ag-based catalyst, the exhaust gas cleaning filter enabling contact property of a catalyst and PM to be improved, and thereby capable of effectively cleaning PM by a small catalyst supporting amount.SOLUTION: The exhaust gas cleaning filter includes: a filter body which has pores having an average pore diameter of 20-35 μm, thereby having a rugged surface; and a catalyst coating film that is supported on a surface of the filter body and comprises an Ag-based catalyst cleaning a captured particulate substance, where a supported amount of the Ag-based catalyst is 10-45 g/L per a unit volume of the filter body, thereby the catalyst coating film is supported in a rugged state along the ruggedness of a surface of the filter body. A surface of the catalyst coating film is observed by enlarging the same by 3,000 times, and a surface observation image including the pores of the average pore diameter is obtained. The obtained surface observation image is three dimensionally processed to obtain dimensional image information. A surface area of a surface of the catalyst coating film calculated based on the three dimensional image information is 2,300-2,950 μm.