The present invention is intended to suppress a reduction in insulation between a heat generation element and a case resulting from PM in an electric heating catalyst. In the electric heating catalyst which has an inner pipe (6a) arranged so as to be located between the heat generation element and the case, a precious metal band (10) is formed on at least either one of an inner peripheral surface and an outer peripheral surface of that portion (6a) of the inner pipe which protrudes from an end face of an insulating support member into an exhaust gas, in such a manner as to extend around on a circumferential surface thereof.