NOVELTY - A resin composition contains a cyclic olefin-type polymer having a specific hydrocarbon group-containing structure (1).    USE - For container and transparent substrate of wet solar cell (both claimed) used for building, road sign, public co-labeling, visual guidance mark, bumping post and illumination lamp.    ADVANTAGE - The resin composition has excellent transparency, moisture resistance, weather resistance and chemical resistance.    DETAILED DESCRIPTION - A resin composition contains a cyclic olefin-type polymer having a hydrocarbon group-containing structure of formula (1).    x,y=copolymerization ratio, and molar ratio of y/x is 0-100-95/5;    n=substitution number of substituent (Q), and is 0-2;    R1=2+n valent group chosen from 2-20C hydrocarbon;    substituent (Q)=COOR4;    R2,R4=univalent group chosen from 1-10C hydrocarbon consisting of hydrogen atom or carbon, or H;and    R3=tetravalent group chosen from 2-10C hydrocarbon.    INDEPENDENT CLAIMS are included for the following:    (1) container (16) for wet solar cell, which is obtained by molding the resin composition. The container is accommodated with electrolyte liquid for wet solar cell;    (2) transparent substrate (11) for wet solar cell, which is obtained by molding the resin composition. The substrate is arranged at light-receiving surface of solar cell;    (3) wet solar cell, which has the container accommodated with electrolyte liquid, the transparent substrate provided such that opening(s) are optionally covered, and a pair of electrode (12,18) facing in the space formed between the container and the transparent substrate; and    (4) method to use the resin composition as a material for the container and for the transparent substrate.    DESCRIPTION OF DRAWING(S) - The figure shows the sectional drawing of wet solar cell. (Drawing includes non-English language text)    Wet solar cell (10)    Transparent substrate (11)    Electrodes (12,18)    Oxide semiconductor film (14)    Container (16)