Honeycomb catalyst body

A honeycomb catalyst body comprising:

• a plugged honeycomb structure having porous partition walls defining a plurality of cells extending from an inflow side end face to an outflow side end face and to become through channels of a fluid, inflow side plugged portions provided at outflow side ends of the predetermined cells, outflow side plugged portions provided at inflow side ends of the remaining cells, and porous projecting portions projecting so as to extend from the partition walls into the cells and being formed integrally with the partition walls;
• and
• a catalyst loaded onto the projecting portions of the plugged honeycomb structure,
• wherein a porosity of each of the partition walls of the plugged honeycomb structure is 40% or more and smaller than 60%,
• a thickness of each of the projecting portions is from 30 to 140% of a thickness of each of the partition walls,
• an amount of the catalyst loaded onto the partition walls in a cross section perpendicular to an extending direction of the cells is 40% or less of a total amount of the catalyst loaded onto the plugged honeycomb structure, and
• an amount of the catalyst to be loaded onto the partition walls is smaller than an amount of the catalyst to be loaded onto the projecting portions.