Stretched film, process for producing the same, and liquid crystal display device

A stretched film comprised of a "B1" layer comprised of a thermoplastic resin 1, an "A" layer comprised of a styrene-based resin, and a "B2" layer comprised of a thermoplastic resin 2 stacked in that order and having a width of over 1000 mm, wherein a ratio of the "A" layer in the stretched film is 45 wt % or less, an average value of an orientation angle with respect to a width direction across at least 1000 mm of the width direction is 0°±1°, a variation in orientation angle is 0.5° or less, and a value of an Nz coefficient is −3.5 to −0.5 in range.