TWI831126B

This belt-like optical film includes, in a film surface, an obliquely stretched film that has a slow axis inclined with respect to the width direction of the optical film, and an easily adhesive layer that is disposed on a surface of the obliquely stretched film. When the middle points in the width direction of the obliquely stretched film at 0m position, 10m position, and 20m position in a direction orthogonal to the width direction of the film are defined as m0, m1, and m2, a saber form which is represented by a distance of the m1 to the center line connecting the m0 and the m2 in the width direction of the film is not less than 10 mm and the indentation elastic modulus of the easily adhesive layer is 1.5-3.0 GPa.