The utility model relates to a vehicle window lifter (40) and a vehicle door comprising the vehicle window lifter. The vehicle window lifter comprises a first guide rail and a second guide rail (42, 44), and a first sliding part and a second sliding part (64, 66) which are used for driving a vehicle window, wherein the first sliding part and the second sliding part (64, 66) are guided by the first guide rail and the second guide rail (42, 44) in a translation manner respectively. The vehicle window lifter further comprises a cable system (54) which is used for driving the sliding parts (64, 66) along the first guide rail and the second guide rail (42, 44), wherein the cable system comprises a cable (56) which stretches between the first guide rail and the second guide rail (42, 44), and is used for connecting the corresponding end parts of the first guide rail and the second guide rail (42, 44) respectively; and the first guide rail (42) comprises a retainer (68) which is used for retaining the cable (56) between the two corresponding end parts of the first guide rail and the second guide rail (42, 44) connected by the cable (56).