Provided is an oxygen-absorbing polyester resin composition that has excellent oxygen absorption properties even in the absence of a transition metal catalyst, and that also has excellent oxygen absorption properties regardless of the glass transition temperature of the polyester resin included as a base resin. The oxygen-absorbing polyester resin composition contains: a base resin (A) comprising a polyester resin; an oxygen-absorbing component (B) comprising a compound having an unsaturated alicyclic structure; and a compound having benzyl hydrogen as a pro-oxidant component (C) for promoting the oxidation of the oxygen-absorbing component (B).
