Walker (1； 100) comprising a base frame (2) supported by wheels (22； 122) and support bars (3, 4) mounted on the base frame (2) to support, at a suitable height, support means (7, 8； 107) designed to support the patient while walking, in which the support rods (3, 4) are articulated to each other and to the base frame (2), in such a way that they go from an operative position, in where the support means (7, 8； 107) are at a suitable height to support the patient, to a position of minimum volume, in which the support means (7, 8； 107) are close to the base frame ( 2), the walker comprises an upper frame (6), the upper frame is provided with the support means, wherein the support rods comprise at least one lower rod (3) articulated by means of a lower hinge (30) to the base frame (2) and at least one upper rod (4), characterized in that the lower rod (3) comprises an outer tube (32) in which e an inner tube (33) is arranged and the upper rod (4) comprises an outer tube (42) in which an inner tube (43) is arranged, wherein a lower end of the inner tube (33) of the lower rod is articulated by means of the lower hinge to the base frame (2) and the other end of the inner tube (33) of the lower bar is connected to elliptical covers (34, 44), a lower end of the outer tube (32) of the lower bar is articulated by means of the lower hinge to the base frame (2) and the outer tube (32) of the lower bar is connected to the elliptical covers (34, 44)； wherein an upper end of the inner tube (43) of the upper bar is articulated by an upper hinge (60) to the upper frame (6) and the other end of the inner tube (43) of the upper bar is connected to the elliptical covers (34, 44), an upper end of the outer tube (42) of the upper bar is articulated by means of the upper hinge (60) to the upper frame (6) and the other end of the outer tube (42) of the upper bar is connected to the elliptical covers (34, 44), wherein the outer tubes (32, 42) of the lower bar and the upper bar are connected
