POLARIZER MANUFACTURING METHOD AND POLARIZER

Provided is a method capable of efficiently producing a polarizer in which the occurrence of cracks is suppressed even in a harsh environment such as a thermal shock test. A method of manufacturing a polarizer according to an embodiment of the present invention comprises: forming a workpiece by overlapping a plurality of polarizers; and processing the outer peripheral surface of the workpiece using a spiral file, and setting the surface roughness Sdr of the polarizer end surface of the polarizing plate to 11% or more according to ISO 25178. 本发明提供可有效地制造即使是在热冲击试验那样的严酷的环境下也抑制了裂纹产生的偏振片的方法。本发明的实施方式的偏振片的制造方法包括：将多片偏振片重叠而形成工件；以及，使用螺旋锉刀将工件的外周面进行加工，将偏振片的起偏器端面的依据ISO 25178的面粗糙度Sdr设定为11％以上。