Honeycomb structure

A honeycomb structure, comprising:

• a pillar shaped honeycomb structure portion having:
• porous partition walls extending through the honeycomb structure from an inflow end face to an outflow end face, to define a plurality of cells forming a through channel;
• an outer peripheral wall located at the outermost periphery;
• and
• a pair of electrode portions disposed on a side surface of the honeycomb structure portion;
• wherein each of the pair of electrode portions is formed in a strip shape extending in an extending direction of the cells of the honeycomb structure portion;
• wherein, in a cross section orthogonal to the extending direction of the cells, one electrode portion of the pair of electrode portions is disposed on a side opposed to the other electrode portion across a center of the honeycomb structure portion;
• wherein the honeycomb structure portion consists an outer peripheral region including the outer peripheral wall;
• a central region that is a center area;
• and an intermediate region excluding the outer peripheral region and the central region;
• and
• wherein an average electric resistivity A of a material constituted of the outer peripheral region, an average electric resistivity B of a material constituted of the central region and an average electric resistivity of C of a material constituted of the intermediate region satisfy the relationship:
• A≤B<C.