A rollator walker with a travel carriage, a frame, and a support for a person's leg, the inclination of which, with respect to a horizontal plane in the direction of the longitudinal axis of the support, can be adjusted. The support is mounted on a supporting part, which is firmly connected to the frame via a joint with a first axle which is horizontal and transverse with respect to the longitudinal axis of the support, and via a supporting element which is at a distance from the first axle in the direction of the longitudinal axis of the support. The supporting element is connected to the supporting part via a manually adjustable mechanical positioning element, by which the vertical position of the supporting element can be changed with respect to the supporting part. As a result, the inclination of the support is adjustable without loss of stability, and the support is held securely in any set inclination position.