Disclosed is an oxygen-absorbable resin composition which enables the reduction in size of an ultraviolet ray irradiation device for use in the initiation of the absorption of oxygen and which can initiate to absorb oxygen rapidly upon the irradiation with ultraviolet ray having a specific wavelength. Specifically disclosed is an oxygen-absorbable resin composition which comprises an initiator, a transition metal catalyst and a readily oxidized resin, and which can initiate to absorb oxygen upon the irradiation with ultraviolet ray having a peak wavelength falling within the range from 300 to 400 nm.