The present application provides a composition for an optical material containing a compound (a) and/or a compound (b) and a compound (c) which are described below. The proportion of the compound (a) and/or the compound (b) is 0.001-30.0% by mass. The compound (a) is a compound represented by formula (1). The compound (b) is a compound represented by formula (2). The compound (c) is an episulfide compound.