Guide vane

A guide vane for a guide wheel of a pump or turbine, comprising a guide vane body having two end faces, a guide vane leading edge, a guide vane trailing edge, as well as a first flow-guiding side face and a second flow-guiding side face which connect the guide vane leading edge and the guide vane trailing edge and form different flow profiles along an axial extension, each of which flow profiles has a chord, a mean camber line, and a mean camber curve end angle at which the mean camber line-is positioned to the chord at the guide vane trailing edge, wherein the guide vane can be mounted such that it can rotate about an axis of rotation which, in particular, is defined by two pivot pins, wherein, along the axial extension, the guide vane has at least one flow profile with a positive mean camber curve end angle and at least one flow profile with a negative mean camber curve end angle, wherein the guide vane leading edge is tilted relative to the axis of rotation.