PLASTIC FILM FOR OPTICAL APPLICATIONS, POLARIZATION PLATE, AND IMAGE DISPLAY DEVICE

Provided is an optical plastic film that can suppress rainbow unevenness when visually recognized with naked eyes and blackout when visually recognized with polarized sunglasses without high in-plane retardation. The optical plastic film has an average of in-plane retardations of 600 nm or less and satisfies the following condition: when a sample with a size of 50 mm in length×50 mm in width is cut out of the plastic film, slow axis directions are measured at a total of five points including four points 10 mm advanced from the four corners of the sample toward the center and the center of the sample, and angles formed by any one side of the sample with the slow axis directions at the measurement points are respectively defined as D1, D2, D3, D4, and D5, the difference between the maximum value of D1 to D5 and the minimum value of D1 to D5 is 5.0 degrees or more.