Exhaust gas purification filter

An exhaust gas purification filter provided in an exhaust pathway of an internal combustion engine, the exhaust gas purification filter being configured to collect and purify particulate matter in exhaust gas from the internal combustion engine, the exhaust gas purification filter comprising:

• a filter base material in which a plurality of cells each extending from an end face on an inflow side for the exhaust gas to an end face on an outflow side are partitioned and formed by partition walls made of a porous material, and at least one cell on the inflow side, where an opening at the end face on the outflow side is sealed, and at least one cell on the outflow side, where an opening at the end face on the inflow side is sealed, are alternately disposed in adjacent positions;
• and
• an exhaust gas purification catalyst supported by the partition walls,
• wherein
• a wash coating amount of the exhaust gas purification catalyst ranges from 60 g/L to 110 g/L inclusive,
• the exhaust gas purification catalyst is supported inside the partition walls and by surfaces of the partition walls,
• when the exhaust gas purification filter is divided into an upstream part, a middle part, and a downstream part from the inflow side to the outflow side, and
• in each of the upstream part, the middle part, and the downstream part, an average value of a catalyst area ratio on the inflow side and a catalyst area ratio on the outflow side is acquired,
• the catalyst area ratio on the inflow side being measured at a predetermined location in the cell on the inflow side with a scanning electron microscope (SEM) and representing an area ratio of the exhaust gas purification catalyst supported by the surfaces of the partition walls and
• the catalyst area ratio on the outflow side being measured at a predetermined location in the cell on the outflow side with the SEM and representing an area ratio of the exhaust gas purification catalyst supported by the surfaces of the partition walls,
• a minimum value, among the average values, is 28% or greater, and
• when a median pore size (DSO) in the partition walls of each of the upstream part, the middle part, and the downstream part after the exhaust gas purification catalyst is supported is acquired on a volumetric basis, a maximum value thereof is 14.6 μm or less.