To keep oxygen absorptive capacity in a reinforced sheet without enclosing a small bag containing deoxidizer in a container by a structure wherein an absorbing layer, both the sides of which are covered with a polyolefin- based resin, and a paper layer, at least one side of which is covered with a polyolefin-based resin, are pasted to each other under the state that the polyolefin-based resin are faced outside.

The polyolefin-based resin surface of an absorbing layer 11, both the sides of which are covered with polyolefin-based resins 12 and 13, and the paper side surface of a paper layer 14, one side of which is covered with polyolefin-based resin 15, are pasted to each other. The absorbing layer 11 is a resin layer, to which an oxygen absorber is added. In this case, the preferable resin is a polyolefin-based resin such as low density polyethylene (henceforth expressed as LDPE), kneaded resin of LDPE and ethylene-propylene copolymer, kneaded resin of LDPE and ethyelne-1-butene copolymer or the like. Further, the preferable oxygen absorber is a mixed system of gallic and sodium carbonate. The preferable mixing ratio of the oxygen absorber to the resin is about 30-50wt.%. The polyolefin-based resins 12, 13 and 15 are preferably the same as that employed in the absorbing layer.