NOVELTY - A base material surface is plasma processed by glow discharge, and a polymeric resin is laminated on the processed surface. A gas barrier layer is further laminated to obtain a gas barrier film. A metal is adhered on the plasma processed surface. The resin in the polymeric layer is obtained by mixing pure water with silane compound, adding hydrochloric acid or acetic acid to the produced mixture to obtain main component, diluting the main component, adding curing catalyst for promoting the hardening reaction of the silane type compound and producing the resin.    USE - Manufacture of gas barrier film used as solar cell backsheet (both claimed), and packaging material for foodstuffs and electronic components.    ADVANTAGE - The gas barrier film has excellent hot water tolerance, gas barrier property and excellent delamination resistance.    DETAILED DESCRIPTION - A base material surface is plasma processed by glow discharge in air pressure of 1x 10-1-1x 10-3 torr, and a polymeric resin is laminated on the processed surface. A gas barrier layer is further laminated to obtain a gas barrier film. Metal chosen from 4th period, 4-12 group or their alloys is adhered on the plasma processed surface. The polymeric resin layer has thickness of 0.03-3 mu m and contains thermosetting resin. The hardening reaction of the polymeric resin is accelerated by epoxy ring-opening polymerization and condensation reaction. The resin in the polymeric layer is obtained by mixing (in parts weight) pure water (50) with a silane compound (100), adding hydrochloric acid or acetic acid to the produced mixture to adjust pH to 3-5 to obtain a main component, diluting the main component, adding a curing catalyst (1-10) with respect to the dilution liquid (100) for promoting the hardening reaction of the silane type compound and producing the resin. The silane type compound contains ( gamma )-glycidoxypropyl-trimethoxysilane and/or ( gamma )-glycidoxypropyl-triethoxysilane. The curing catalyst is iron acetylacetonate, zinc acetylacetonate, aluminum acetylacetonate, tin tetrachloride, diisopropoxy-bis acetylacetonato titanium or titanium dihydroxy bislactate.