Catalyst device

A catalyst device for an exhaust passage of an internal combustion engine including a forced-induction device, the catalyst device comprising:

• a catalyst support configured to purify exhaust gas, the catalyst support including a catalyst upstream end;
• a heating element configured to heat the catalyst support by generating heat when energized;
• a case of the exhaust passage formed as a pipe configured to accommodate the catalyst support and the heating element, the case including an upstream end portion which protrudes upstream of the catalyst upstream end;
• and
• an outer tube configured to be radially separated from the case so as to concentrically overlap with the upstream end portion of the case,
• wherein the upstream end portion of the case is an insulating portion configured to insulate electricity, and
• wherein the outer tube is at least partially defined by a turbine housing that houses a turbine wheel of the forced-induction device.