Honeycomb structure and bonded type honeycomb structure

A honeycomb structure comprising:

• a porous partition wall defining a plurality of cells serving as fluid passages;
• an outer peripheral wall located at the outermost periphery;
• a first cell having one end opened and the end plugged;
• and
• a second cell having the one end plugged and the other end opened, wherein:
• said first cells and said second cells are disposed alternately;
• and
• the area of said first cells is larger than that of said second cells in a cross section perpendicular to a center axis, and wherein
• in a cross section perpendicular to the center axis, when the region from a gravity center of an outer peripheral shape to a boundary formed by points at the middle of the distance between said gravity center and the outer periphery of said outer peripheral wall is defined as a center section and the region outside said center section is defined as an outer peripheral section, the thickness of said partition wall that forms at least one cell from the outermost periphery in said outer peripheral section is 1.1 to 3.0 times the thickness of the partition wall in said center section.