A hinge device for tilting windows, particularly tilting windows for installation in an inclined roof, includes two hinge parts adapted to be secured to the frame of the window and its sash, respectively, the hinge parts having respective base plates, a guide on one of the base plates, the guide forming a part-circular guide channel, a slide member on the other of the base plates, the slide member corresponding in shape to the guide channel and defining a tilting axis spaced from the plane of the window, a plate element forming the concave guide on one side of the part-circular guide channel, the plate element being spaced from the base plate and secured thereto by rivets or similar pins to the base plate of the hinge part, an arched blade spring arranged in the space between the plate element and the base plate, the blade spring having curved end portions gripping partly around and held in place by two of the rivets securing the plate element, a guide pin on the hinge part having the slide member, the guide pin being positioned to frictionally engage the concave surface of the arched blade spring when the sash is moving close to its closed position, and an undulated spring having legs resting on the convex side of the arched blade spring, the undulated spring spring-loading the arched blade spring while a mid portion is supported against a rivet located intermediate to the two blade spring supporting rivets.