A window lifter includes at least one panel, a rail for guiding a slider, and a lower attachment of the lower end of the rail to the panel able selectively to cause the rail to slide transversely with respect to the panel, and a one-piece upper attachment of the upper end of the rail to the panel able to cause the upper end of the rail to pivot with respect to the panel about a longitudinal axis. The window lifter makes it possible to reduce the number of parts in a window lifter and makes it easier to assemble.