A turbine housing, comprising: a housing body which includes a turbine housing part housing a turbine wheel, an inlet section forming an inlet flow passage for guiding exhaust gas to the turbine housing part, an outlet section forming an outlet flow passage for discharging the exhaust gas from the turbine housing part, and a waste-gate flow passage which brings the inlet flow passage and the outlet flow passage into communication so as to bypass the turbine housing part, the waste-gate flow passage being formed by an inner wall surface of the housing body; and a sleeve disposed along the inner wall surface forming the waste-gate flow passage, at least on a downstream side of the waste-gate flow passage of the housing body with respect to a flow direction of the exhaust gas, wherein the housing body includes a concave portion disposed along a peripheral edge of an opening end on the downstream side of the waste-gate flow passage of the housing body with respect to the flow direction of the exhaust gas, and wherein the sleeve includes a convex portion disposed so as to project outward in a radial direction of the sleeve so as to be engaged with the concave portion, wherein the sleeve is inserted into the waste-gate flow passage from the outlet section toward the inlet section to be supported on the housing body so that a gap is formed between the inner wall surface forming the waste-gate flow passage and an outer surface of the sleeve, characterized in that the housing body includes an annular pressure support portion disposed so as to protrude by a width of the gap inward in a radial direction from the inner wall surface of the housing body. a housing body which includes a turbine housing part housing a turbine wheel, an inlet section forming an inlet flow passage for guiding exhaust gas to the turbine housing part, an outlet section forming an outlet flow passage for discharging the exhaust gas from the turbine housing part, and a waste-gate flow passage which brings the inlet flow passage and the outlet flow passage into communication so as to bypass the turbine housing part, the waste-gate flow passage being formed by an inner wall surface of the housing body; and a sleeve disposed along the inner wall surface forming the waste-gate flow passage, at least on a downstream side of the waste-gate flow passage of the housing body with respect to a flow direction of the exhaust gas, wherein the housing body includes a concave portion disposed along a peripheral edge of an opening end on the downstream side of the waste-gate flow passage of the housing body with respect to the flow direction of the exhaust gas, and wherein the sleeve includes a convex portion disposed so as to project outward in a radial direction of the sleeve so as to be engaged with the concave portion, wherein the sleeve is inserted into the waste-gate flow passage from the outlet section toward the inlet section to be supported on the housing body so that a gap is formed between the inner wall surface forming the waste-gate flow passage and an outer surface of the sleeve, characterized in that the housing body includes an annular pressure support portion disposed so as to protrude by a width of the gap inward in a radial direction from the inner wall surface of the housing body.