Patent ID: 8734558

Claim:
An exhaust gas purification filter comprising: a honeycomb structure having porous ceramic partition walls separating and forming a plurality of cells functioning as exhaust gas passages and extending from one end portion to the other end portion, plugging portions disposed in one side open end portions of predetermined cells and in the other side open end portions of the other cells, and a surface trapping layer disposed on the surface of each of the cells having open end portions on an exhaust gas inflow side of the honeycomb structure, wherein the partition walls have a thickness of 0.05 mm or more and 0.18 mm or less, the partition walls have a porosity of 35% or more and 50% or less. the partition walls have an average pore size of 10 μm or more and 18 μm or less, which is measured by mercury porosimetry, and the proportion of the volume of the pores having a size of twice the average pore size or more in the entire pore volume in a pore size distribution of the partition walls measured by mercury porosimetry is 5% or more and 40% or less, and the surface trapping layer has an average pore size of 0.1 μm or more and 5 μm or less, a porosity of 50% or more and 80% or less, and a thickness of 1 μm or more and 50 μm or less.