A magnetic tape in which a servo signal for tracking control is recorded in a magnetic layer or a backcoat layer, the difference between the recording track width and the reproducing track width is 16 µm or under, and the tape is transported at a tape transport speed of 4,000 mm/s or over. [&agr;/(Tw−Tr)] is 0.2 or under, the humidity expansion coefficient in the tape width direction is 0−14 × 10 −6 /%RH, and the coefficient of thermal expansion is 0−10 × 10 −6 /°C, where &agr;(µm) is the edge weave present on one tape edge or the other tape edge on the transport reference side when the tape is being transported, Tw (µm) is the recording track width, and Tr (µm) is the reproducing track width (µm). The recording track width of this magnetic tape is 28 µm or under. Even when the difference between the recording track width and the reproducing track width is 16 µm or under, degradation of the reproduction output by off−track hardly occurs, and the servo characteristic is excellent.