The present invention realizes a
polymer substrate with hard
coating layer comprising a high level of
environmental resistance and a high level of abrasion resistance.A
polymer substrate with hard
coating layer is provided that comprises a
polymer substrate (60) having a thickness of 1 mm to 20 mm and a hard
coating layer (70,80) on the surface thereof. Here, in this
polymer substrate with hard coating layer, the hard coating layer (70,80) is laminated on the surface of the
polymer substrate, contains as a main component thereof a
hydrolysis-condensation product of an organic
silicon compound, has a thickness of 0.1 μm to 20 μm, makes direct contact with a cured underlayer on the opposite side of the
polymer substrate, is formed from an organic
silicon compound by PE-CVD, and satisfies all of the following requirements (a) to (c): (a) film thickness of the
silicon oxide layer is within the range of 3.5 μm to 9.0 μm, (b) maximum indentation depth of the surface of the
silicon oxide layer as determined by measuring
nanoindentation under conditions of a maximum load of 1 mN is 150 nm or less, and (c) the value of critical
compression ratio K of the
silicon oxide layer, as defined by formula (1) in a 3-point bending test of the polymer substrate with hard coating layer that imparts indentation displacement in which the surface laminated with the
silicon oxide layer becomes concave, is 0.975 or less.