Exhaust purification filter

The problem addressed by the present invention is to provide an exhaust gas purification filter which is provided in an exhaust gas passage of an internal combustion engine and which captures and purifies particulate matter in exhaust gas of the internal combustion engine. A plurality of cells, which extend from the end surface of the exhaust gas inflow side to the end surface of the exhaust gas outflow side, are formed by being partitioned by a porous partition wall, and inflow-side cells and outflow-side cells, which are closed on the end surface of the exhaust gas outflow side, are alternately arranged. The end surface of the outflow-side compartment on the side into which the exhaust gas flows is closed; and an exhaust gas purification catalyst supported on the surfaces of the porous partition walls, the porosity of the filter base material being 55-70%, and the ratio of the outer peripheral portion to the central portion of the average thickness of the porous partition walls of the filter base material b