TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The layer having multilayered structure has outer side layer, intermediate layer, and inner side layer.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The carbonyl containing group is chosen from carbonate group, halo formyl group, aldehyde group, ketone group, carboxy group, alkoxycarbonyl group, carbon acid-anhydride group and isocyanato groups. The content rate of structural units other than the side chain 1,2-diol structural unit, and vinyl alcohol structural unit is less than 20 mol%.    TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The weight ratio of vinyl alcohol-type resin and fluororesin having polar functional group is 9.5/0.5-5/5. The fluororesin is carbonyl containing group or hydroxyl group. The fluororesin having polar functional group is copolymer containing tetrafluoroethylene as structure monomer. The fluororesin having polar functional group contains ethylene as structure monomer. The fluororesin having polar functional group is ethylene/tetrafluoroethylene copolymer, ethylene/tetrafluoroethylene/hexafluoropropylene-type copolymer, ethylene/tetrafluoroethylene/CH2=CH-Rf-type copolymer, or ethylene/tetrafluoroethylene/hexafluoropropylene/CH2=CH-Rf-type copolymer. The content rate of side chain 1,2-diol-containing structural unit in vinyl alcohol-type resin is 0.1-30 mol%. The content rate of side chain 1,2-diol structural unit in the polyvinyl alcohol resin (A') is 2-15 mol%. The side chain 1,2-diol containing vinyl alcohol-type resin is ethylene-vinyl-ester copolymer saponified compound (A"). The content rate of side chain 1,2-diol structural unit in the ethylene- vinyl ester-type copolymer saponified compound (A") is 0.5-10 mol%. The constituent material of one layer of at least any one other than the layer is chosen from polyolefin resin, polyamide-type resin and polar group containing fluorine resin.Rf=2-6C perfluoroalkyl.Preferred Property: The melting point of fluororesin having polar functional group is 120-240 degrees C.