NOVELTY - A polymerizable composition comprises layer compound (A), solvent or dispersion medium (B) having boiling point of 150 degrees C or less at normal temperature, and polymeric compound (C) having boiling point of 150 degrees C or more at normal pressure. The compound (C) is radically polymerizable compound chosen from (meth)acrylate (C-1) having fluorine atom and (meth)acryloyl group(s) in the terminal or side chain, polymer (C-2) having main structure containing optionally hydrogenated butadiene unit or isoprene unit, and (meth)acrylate (C-3) having phenoxy ethyl group.    USE - Polymerizable composition for manufacturing molecule-blocking film used for protection sheet for solar cell module, and for adhesive agent (all claimed).    ADVANTAGE - The polymerizable composition produces film having high molecule-blocking property. The hardened material produced using the composition has excellent barrier property with respect to water vapor, oxygen and carbon dioxide. The protection sheet can be used efficiently in extreme weather conditions and wide temperature regions.    DETAILED DESCRIPTION - A polymerizable composition comprises layer compound (A), solvent or dispersion medium (B) having boiling point of 150 degrees C or less at normal temperature, and polymeric compound (C) having boiling point of 150 degrees C or more at normal pressure. The mass ratio of the compound (A) and compound (C) is 50:50-90:10. The compound (C) is radically polymerizable compound chosen from (meth)acrylate (C-1) having fluorine atom and (meth)acryloyl group(s) in the terminal or side chain, polymer (C-2) having main structure containing optionally hydrogenated butadiene unit or isoprene unit, and (meth)acrylate (C-3) having phenoxy ethyl group. An INDEPENDENT CLAIM is included for manufacture of molecule-shielding film, which involves polymerizing and hardening compound (C) after coating the polymeric composition on a base material, and drying and distilling solvent or dispersion medium.