Patent ID: 7651775

Claim:
A plastic optical component comprising: an optical component's body; and an inorganic moisture-proof coating which is directly or indirectly formed by a plasma CVD process at least on surfaces of the optical component's body that contact outside air, wherein the plastic optical component is kept at a temperature of 80° C. or lower when the inorganic moisture-proof coating is formed by the plasma CVD process, and wherein the inorganic moisture-proof coating is of a structure in which two or more inorganic compound layers whose compositions are different from each other and are represented by SiOx 0 Ny 0 where 0 ≦x 0 ≦2, 0≦y 0 ≦1.33 and 2x 0 +3y 0 ≦4 provided that y 0 =0 in an outermost layer of the two or more inorganic compound layers that contacts the outside air and y 0 ≠0 in its innermost layer that contacts the plastic optical component, are laminated onto the optical component's body.