Turbine housing and turbo charger provided with same

A turbine housing connected to a bearing housing rotatably supporting a rotating shaft of a turbine wheel, the turbine housing comprising:

• a housing part having a first inner circumferential side wall portion, a first outer circumferential side wall portion, and a first bottom surface part and forming a spiral space extending around the rotating shaft;
• a flow passage part having a second inner circumferential side wall portion, a second outer circumferential side wall portion, and a second bottom surface part, disposed in the spiral space, and forming a spiral exhaust gas flow passage in which exhaust gas introduced from an exhaust gas introduction port flows;
• and
• a nozzle part guiding the exhaust gas introduced into the exhaust gas flow passage to the turbine wheel connected to the rotating shaft, wherein
• a heat-shielding space is formed between an inner circumferential surface of the housing part and an outer circumferential surface of the flow passage part,
• the flow passage part has an inner circumferential side flange part protruding from the second inner circumferential side wall portion to an inner circumferential side in a radial direction of the rotating shaft and an outer circumferential side flange part protruding from the second outer circumferential side wall portion to an outer circumferential side in the radial direction, and
• the inner circumferential side flange part is fixed between the nozzle part and the housing part in a state where an annular seal part elastically deformable in a direction along the rotating shaft is interposed between the inner circumferential side flange part and the nozzle part and the outer circumferential side flange part is fixed between the nozzle part and the housing part.