high productivity polarizing lens that is impact - resistant , and is not prone to warping or iridescent patterning and other color irregularities . polarizing lens includes a polarizing sheet in which a pair of protective films and is laminated on both sides of a polarizing film , and a lens base material layer integrally bonded on a rear side of the polarizing sheet , the lens base material layer being composed of polyurethane . manufacturable by : bending the polarizing sheet at a predetermined curvature ; fitting the polarizing sheet in a mold recessed with a cavity contoured to correspond to the bent polarizing sheet so that its front side runs along the cavity ; and filling and injection - molding thermoplastic polyurethane into the mold in which the polarizing sheet has been fit , to form the lens base material layer on the polarizing sheet rear side .