Abstract: A device for operating a vertical window, which is laterally displaceably mounted between an upper and a lower horizontal guide rail, has a handle, which is pivotally connected to a vertical frame part positioned at one lateral edge of the window, and a link element, which is hinged on a first and a second hinge axis and connected to the handle and, respectively, to a lower guide member which is positioned at said lateral edge of the window and arranged to engage the lower guide rail to guide the window on this. The handle and the link element are arranged to press, as the handle pivots from a starting position in one direction, said lower guide member downwards from an upper position so as to tilt the window to a tilted position.