A variable capacity turbocharger comprising: a turbine impeller which includes turbine blades; a plurality of inlet guide vanes , each having a shaft portion , being rotatable around an axis (O) of the shaft portion , and being disposed at the periphery of the turbine impeller ; a shroud surrounding a tip side of the turbine blades; an opposing wall that is separated from the shroud in a height direction of the inlet guide vanes ; and a nozzle (N) sandwiched by the shroud and the opposing wall , the nozzle (N) being provided with the inlet guide vanes , wherein a leading edge of the inlet guide vanes in the height direction of the inlet guide vanes has a curved-line shape relative to the distance from the axis (O) of the shaft portion of the inlet guide vanes to the leading edge which distance changes depending on a height position of the inlet guide vanes , a trailing edge of the inlet guide vanes in the height direction of the inlet guide vanes has a straight-line shape such that the distance from the axis (O) of the shaft portion of the inlet guide vanes to the trailing edge is constant irrespective of the height position of the inlet guide vanes , a region (R) at which the distance from the axis (O) of the shaft portion to the leading edge is shortest is located in a region sandwiched by both ends in the height direction of the inlet guide vanes , characterized in that : the region (R) is located between the opposing wall and a mid-height section of the inlet guide vanes in the height direction of the inlet guide vanes , the region (R) is closer to the opposing wall than the mid-height section of the inlet guide vanes in the height direction of the inlet guide vanes , the curved-line shape extends along the entire height of the inlet guide vanes , and the curved-line shape results in a decreasing vane camber length from both ends in the height direction of the inlet guide vanes toward the region (R). a turbine impeller which includes turbine blades; a plurality of inlet guide vanes , each having a shaft portion , being rotatable around an axis (O) of the shaft portion , and being disposed at the periphery of the turbine impeller ; a shroud surrounding a tip side of the turbine blades; an opposing wall that is separated from the shroud in a height direction of the inlet guide vanes ; and a nozzle (N) sandwiched by the shroud and the opposing wall , the nozzle (N) being provided with the inlet guide vanes , wherein a leading edge of the inlet guide vanes in the height direction of the inlet guide vanes has a curved-line shape relative to the distance from the axis (O) of the shaft portion of the inlet guide vanes to the leading edge which distance changes depending on a height position of the inlet guide vanes , a trailing edge of the inlet guide vanes in the height direction of the inlet guide vanes has a straight-line shape such that the distance from the axis (O) of the shaft portion of the inlet guide vanes to the trailing edge is constant irrespective of the height position of the inlet guide vanes , a region (R) at which the distance from the axis (O) of the shaft portion to the leading edge is shortest is located in a region sandwiched by both ends in the height direction of the inlet guide vanes , the region (R) is located between the opposing wall and a mid-height section of the inlet guide vanes in the height direction of the inlet guide vanes , the region (R) is closer to the opposing wall than the mid-height section of the inlet guide vanes in the height direction of the inlet guide vanes , the curved-line shape extends along the entire height of the inlet guide vanes , and the curved-line shape results in a decreasing vane camber length from both ends in the height direction of the inlet guide vanes toward the region (R). <EOS>