Provided is a method for manufacturing an optical film, in which two optical films stacked one upon another can be cut without being damaged, and the optical films are connected with high work efficiency. A method of manufacturing an optical film includes a step of overlapping a first optical film and a second optical film and cutting the first optical film and the second optical film with a blade, the first optical film and the second optical film having a surface treatment layer on one side and being overlapped such that the surface treatment layer is disposed on the same side, The method according to claim 1, wherein in the step, the blade first contacts the surface treatment layer of the first optical film with an angle formed by its cutting edge and surfaces of the first optical film and the second optical film set to 100 degrees or more...

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