PLASTIC LENS

The present invention aims at providing a plastic lens having excellent heat resistance and durability in which generation of cracks is suppressed even in high-temperature environments or when a mechanical stress being applied, and has excellent surface hardness and scratch resistance. The present invention provides a plastic lens containing a plastic lens substrate, a layer formed on at least one surface of the plastic lens substrate, and a vapor deposition coated film formed on at least one surface of the hard coating layer, the hard coating layer being a cured product of a curable composition containing a polyorganosilsesquioxane, the polyorganosilsesquioxane containing a constituent unit represented by Formula (1), a constituent unit represented by Formula (I), hard coating a constituent unit represented by (II), and a constituent unit represented by Formula (4); wherein a molar ratio of the constituent unit represented by Formula (I) and the constituent unit (II) represented by Formula (II) is 5 or greater and 500 or less,a ratio of the constituent unit represented by Formula (1) and the constituent unit represented by Formula (4) relative to the total amount (100 mol%) of siloxane constituent units is from 55 to 100 mol%; a number average molecular weight is from 1000 to 50000; and a molecular weight dispersity (a weight average molecular weight/a number average molecular weight) is from 1.0 to 4.0.