Exhaust gas purification device

An exhaust gas purification device comprising:

• a honeycomb substrate;
• and
• an outflow side catalyst,
• wherein the honeycomb substrate includes a porous partition wall defining a plurality of cells extending from an inflow side end surface to an outflow side end surface,
• wherein the plurality of cells include an inflow cell and an outflow cell adjacent across the partition wall,
• wherein the inflow cell has an open inflow side end and a sealed outflow side end, wherein the outflow cell has a sealed inflow side end and an open outflow side end,
• wherein the outflow side catalyst is disposed in an inner region on the outflow cell side of the partition wall in an outflow side catalyst-disposed range extending from an outflow side end of the partition wall to a position apart toward an inflow side along an extending direction, and
• wherein in the outflow side catalyst-disposed range of the partition wall, 61%-78% is filled with the outflow side catalyst in pores in an outflow cell side surface region up to a depth of a quarter of a thickness of the partition wall from a surface on the outflow cell side of the partition wall.