A plastic lens comprising a plastic lens base material having provided on at least one surface thereof (1) a primer layer comprising a resin containing at least one organosilicon compound represented by the following general formula (I):R.sup.1.sub.m R.sup.2.sub.n Si(OR.sup.3).sub.4-m-n (I)wherein R.sup.1 and R.sup.2 each independently represents an alkyl group, an alkenyl group, an aryl group, an aralkyl group or a halogen atom, R.sup.3 represents an alkyl group, an acyl group, an aryl group or an aralkyl group, and m and n are each 0 or 1, or a hydrolyzate thereof, (2) a hard coat layer and, optionally, (3) a reflection preventing layer in this order is disclosed. The plastic lens according to the present invention is characterized by having an excellent scratch resistance even though the lens has the primer layer, and also having an excellent impact resistance even though the lens has the hard coat layer.