Honeycomb filter

A honeycomb filter comprising:

• a pillar-shaped honeycomb substrate including a porous partition wall that defines a plurality of cells extending from an inflow end face to an outflow end face;
• an inflow side plugging portion disposed at the inflow end face of the honeycomb substrate to plug open ends of outflow cells that are a part of the plurality of cells;
• and
• an outflow side plugging portion disposed at the outflow end face of the honeycomb substrate to plug open ends of inflow cells other than the outflow cells of the plurality of cells, wherein
• the honeycomb substrate includes the partition wall that defines two of the inflow cells by division, and
• an average of plugging lengths LOUT of the outflow side plugging portions disposed in the inflow cells of the honeycomb substrate is larger than an average of plugging lengths LIN of the inflow side plugging portions disposed in the outflow cells of the honeycomb substrate by 1.0 to 4.0 mm, and
• the average plugging lengths LOUT is 3.5 to 7.0 mm.