HONEYCOMB FILTER

A honeycomb filter includes a pillar-shaped honeycomb structure body having a porous partition wall disposed, surrounding a plurality of cells which serve as fluid through channels extending from a first end face to a second end face; and a plugging portion provided at an open end on the first end face side or the second end face side of each of the cells, wherein the partition wall is composed of a material containing cordierite as a main component thereof, an average pore diameter of the partition wall is 20 to 30 μm, an average equivalent circle diameter of pores existing at a surface of the partition wall and having equivalent circle diameters exceeding 3.0 μm is 18 to 30 μm, and a number per unit area of pores existing at a surface of the partition wall and having equivalent circle diameters exceeding 3.0 μm is 400 per mm2 or more.