An oxygen absorbing agent containing a compound (A) of formula (I):
wherein X is a chalcogen atom, R
1
and R
2
are each any one of an alkyl group which optionally has a substituent, an alkenyl group which optionally has a substituent, an aryl group which optionally has a substituent, and an aralkyl group which optionally has a substituent, R
3
and R
4
are each any one of a hydrogen atom, an alkyl group which optionally has a substituent, an alkenyl group which optionally has a substituent, an aryl group which optionally has a substituent, and an aralkyl group which optionally has a substituent, and R
5
is a polymerizable group; and a transition metal salt (B).