Transparent plastic substrate and plastic lens

A plastic lens consisting essentially of:

• a transparent plastic substrate comprising:
• a resin component comprising a (thio) urethane resin obtained by reaction of bis(isocyanatomethyl)bicyclo [2.2.1] heptane, pentaerythritoltetrakis(3-mercaptopropionate), and 1,2-bis(2-mercaptoethylthio)-3-mercaptopropane;
• a benzotriazole compound in an amount of 0.10-2.00 parts by mass per 100 parts by mass of the resin component;
• and
• at least one a functional layer selected from a group consisting of a cured film, a primer layer, an antireflection film and a water repellent film,
• wherein the cured film is formed by a coating liquid comprising an organosilicon compound and one or more fine particles being selected from the group consisting of tin oxide, silicon oxide, zirconium oxide and titanium oxide, and
• wherein the transparent plastic substrate has a cut rate of light having a wavelength of 410 nm of 50% or more, and
• wherein the benzotriazole compound is at least one selected from 2-(3-tert-butyl-2-hydroxy-5-methylphenyl)-5-chloro-2H-benzotriazole and 2-(3-tert-butyl-2-hydroxy-5-ethylphenyl)-5-chloro-2H-benzotriazole.