The plastic optical component includes a main body and a transparent moisture-proof coating provided on all surfaces of the main body, the moisture-proof coating satisfying the following relation (1):

(D1/d)(L/D2)10   (1)

where D1 (mm2/s) is a water diffusion coefficient of a first material of which the moisture-proof coating is made, d (mm) is a thickness of the first material, D2 (mm2/s) is the water diffusion coefficient of a second material of which the main body is made, and L (mm) is an average thickness across an optical surfaces of the second material.

 
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