An electrically heating catalytic converter according to the present invention includes: a honeycomb structure 1 having an outer peripheral wall and partition walls defining a plurality of cells; a pair of metal electrodes 2 connected to the honeycomb structure 1; and a housing 3 provided with an inlet 30 and an outlet 31, the housing 3 storing the honeycomb structure 1 therein, wherein the honeycomb structure 1 has a plurality of regions comprising a central region including an axial center of the honeycomb structure and an outer peripheral region adjacent to the outer peripheral wall, wherein the opening percentage of the central region is less than or equal to 0.9 times that of the outer peripheral region, and wherein a diameter of the central region is more than or equal to 65% and less than or equal to 135% of that of the inlet of the housing.