The present invention provides a highly durable, electrically heated catalytic converter including an insulation layer formed on an inner tube, wherein the insulation layer is less susceptible to cracking and peeling even when high thermal stress occurs in the insulation layer at and near the end portion of an inner tube, at upstream of a catalyst carrier. An electrically heated catalytic converter includes a catalyst carrier; a case ; and an electrical insulation mat; wherein the case includes an outer tube and an inner tube; in a cross section upstream of the catalyst carrier taken along a plane including the central axis of the case, the inner tube is curved at least once so as to outwardly project and then obliquely extends toward the central axis of the case, an insulation layer having a thickness of 100 to 200 [mu]m is formed in the range from an end portion of the inner tube to 10% of the length of the inner tube from the end portion of the inner tube to an end of the catalyst carrier, an insulation layer having a thickness of 100 to 400 [mu]m is formed in the range from a point immediately after 10% of the length away from the end portion of the inner tube to 50% of the length of the inner tube from the end portion to the end of the catalyst carrier, and the insulation layer formed in the range from the end portion of the inner tube to 10% of the length is thinner than the insulation layer formed in the range from a point immediately after 10% of the length away from the end portion of the inner tube to 50% of the length.