Patent ID: 7824629

Claim:
A honeycomb structured body comprising: a plurality of honeycomb members bonded together by a bonding material, each honeycomb member including an outer wall, a partition arranged inward from the outer wall, and a plurality of cells partitioned by the partition for functioning as a flow passage for a fluid; and an outer surface formed by an outer coating layer; a filter core portion including a plurality of first honeycomb members of the plurality of honeycomb members, each of the first honeycomb members having a vertical cross-section that is orthogonal to an axis of the honeycomb structured body and rectangular; a filter peripheral portion arranged outside the filter core portion and formed by a plurality of second honeycomb members of the plurality of honeycomb members, each of the second honeycomb members having a vertical cross-section that is orthogonal to the axis and irregular in shape, wherein an outer surface of the filter peripheral portion includes a flat portion defined by the outer wall of at least one honeycomb member; and a filling layer arranged on the flat portion in the outer surface of the filter peripheral portion that is not bonded to the outer wall of any one of the plurality of honeycomb members by the bonding material, the filling layer being sandwiched between the outer coating layer and the flat portion in the outer surface of the filter peripheral portion, the filling layer and the outer coating layer being dried and hardened.