Plugged honeycomb structure

A plugged honeycomb structure comprising:

• a honeycomb structure section having porous partition walls with which a plurality of cells extending from an inflow side end surface to an outflow side end surface are formed to become through channels of a fluid, the plurality of cells including large cells and small cells having different open areas in a cross section perpendicular to an extending direction of the cells;
• inflow side plugged portions arranged in inflow side end portions of the predetermined cells including the large cells and the small cells among the plurality of cells;
• and
• outflow side plugged portions arranged in outflow side end portions of remaining cells including the large cells and the small cells among the plurality of cells,
• wherein the predetermined cells are outflow cells having plugged inflow side end portions and open outflow side end portions, and the remaining cells are inflow cells having plugged outflow side end portions and open inflow side end portions, and
• the large cells provided with the inflow side plugged portions and the small cells provided with the outflow side plugged portions are formed in an outer peripheral portion of the honeycomb structure section, and are not formed in a portion other than the outer peripheral portion.