(JP7090111-A)      In a high polymer solid electrolyte compsn., 0.01-80 wt.% of one or more metal catalysts selected from Pt, Au, Pd, Rh, Ir and Ru are contained in a high polymer solid electrolyte selected from cation-exchange resin or anion-exchange resin.    Cation-exchange resin is e.g. perfluorocarbonsulphonic acid or polysulphone. Anion-exchange resin is styrene-butadiene type anion-exchange resin. In a high polymer solid electrolyte compsn., 0.01-80 wt.% of one or more metal catalysts selected from Pt, Au, Pd, Rh, Ir and Ru and 0.01-50 wt.% of fine particle and/or fibre of metal oxide are contained in the high polymer solid electrolyte. Metal oxide is silica, titania, alumina, zirconia, magnesia or tin oxide.    USE/ADVANTAGE -   The high polymer solid electrolyte compsn. is useful for e.g. membrane of electrochemical cell such as fuel cell. The high polymer solid electrolyte compsn. is excellent in ion-conductivity and crossover-preventing effect (sic).    In an example, a membrane made from the invention's high polymer solid electrolyte compsn. for high polymer solid electrolyte type fuel cell was prepd..    (US5766787-A)      A solid polymer electrolyte compsn. comprises a solid polymer cation or anion exchange resin (I) and 0.01-80 wt.% metal catalyst based on (I). The catalyst is platinum, gold, palladium, rhodium, iridium or lenthenum.    USE -   The solid polymer electrolyte is used as a membrane in a fuel cell.    ADVANTAGE -   The solid polymer electrolyte produces water by itself and retains the water so that it has high ionic conductivity. The membrane (1) also depresses the crossover, leading to superior cell performance.    (EP631337-B1)      A solid polymer electrolyte compsn. comprises a solid polymer cation or anion exchange resin (I) and 0.01-80 wt.% metal catalyst based on (I). The catalyst is platinum, gold, palladium, rhodium, iridium or lenthenum.    USE -   The solid polymer electrolyte is used as a membrane in a fuel cell.    ADVANTAGE -   The solid polymer electrolyte produces water by itself and retains the water so that it has high ionic conductivity. The membrane (1) also depresses the crossover, leading to superior cell performance.