Electrically heated catalyst device

An electrically heated catalyst device comprising:

• a honeycomb structural body comprising an outer skin part having a cylindrical shape and a cell formation part, the cell formation part being covered with the outer skin part;
• a pair of electrodes formed on an outer circumferential surface of the outer skin park, one electrode in the pair of the electrodes facing the other electrode in a radial direction of the honeycomb structural body;
• and
• a pair of electrode terminals formed on the pair of the electrodes toward outside in a radial direction of the honeycomb structural body,
• wherein length edge lines of one electrode and length edge lines of the other electrode extend on the outer circumferential surface of the outer skin part from one end surface to the other end surface of the honeycomb structural body in an axial direction of the honeycomb structural body so that the length edge lines of the electrodes are inclined to a virtual reference line at a predetermined angle, the length edge lines being a longitudinal part in an outline of each electrode, the virtual reference line being a virtual line defined on the outer circumferential surface of the outer skin part, which is parallel to the axial direction of the honeycomb structural body,
• an interval between the electrodes in the pair formed on the outer circumferential surface of the outer skin part of the honeycomb structural body measured along the circumferential direction of the honeycomb structural body is constant,
• the electrode terminals in the pair are formed at a circumferential center of the electrodes so that the electrode terminals keep at a predetermined interval measured in the axial direction of the honeycomb structural body, and the electrode terminals in the pair make an angle of less than 180 degrees (180°) at a radial center of the honeycomb structural body when measured on the outer circumferential surface of the outer skin part and viewed down one end surface which is perpendicular to the axial direction of the honeycomb structural body.