Patent ID: 8647584

Claim:
An electric heating type catalyst comprising: a heat generation element that is electrically energized to generate heat so that a catalyst is heated by the generation of heat; a case that receives said heat generation element therein; an insulating support member that is arranged between said heat generation element and said case for supporting said heat generation element and insulating electricity; an inner pipe that is a tubular member formed of a material which insulates electricity and which is more resistant to water permeation than said insulating support member, said inner pipe being arranged so as to be located between said heat generation element and said case, said inner pipe having an end protruding from an end face of said insulating support member into an exhaust gas; and a precious metal band that is formed on at least either one of an inner peripheral surface and an outer peripheral surface of that portion of said inner pipe which protrudes from the end face of said insulating support member into the exhaust gas, by coating thereon precious metal in a band-shaped manner so as to extend around on a circumferential surface thereof.