Polythiol composition for optical materials polymerizable composition and use thereof

Polythiol composition of the present invention, a polythiol compound having three or more mercapto groups and (A), one mercapto group of the polythiol compound (A) is replaced with a group represented by the following formula (a), and, wherein the polythiol compound (a) nitrogen-containing compounds other one mercapto group is replaced with a hydroxyl group with (B), and in high-performance liquid chromatography measurement, the peak area of ​​the nitrogen-containing compound (B), polythiol compound is 3.0 or less with respect to the peak area 100 of the (a), polythiol composition.