Variable geometry turbocharger

In a variable geometry turbocharger including a variable nozzle mechanism, an object is to enhance safety upon malfunction of the variable nozzle mechanism as well as to improve accuracy in the control of the variable nozzle mechanism by applying a moment that acts on the nozzle vanes in an opening direction securely and stably. A variable geometry turbocharger includes a plurality of nozzle vanes 41a disposed at predetermined intervals around a rotational shaft center of a turbine wheel 7 so as to surround an outer circumferential side of the turbine wheel 7 and a variable nozzle mechanism configured capable of changing a blade angle of each of the nozzle vanes 41a, each of the nozzle vanes 41a having a blade cross-section orthogonal to a nozzle shaft 41b of each nozzle vane 41a, the blade cross-section having: a concave portion 53 curved into a concave shape on at least a part of a pressure surface 45 side, the part being disposed at a trailing edge 51 side with respect to the rotational center C; and a convex portion at a leading edge 49 side with respect to the rotational center C, so that a surface shape of the pressure surface 45 side is a substantially S-shape having the concave portion and the convex portion across a boundary at a same longitudinal position as the rotational center.