TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polymerizable mixture comprises 70-99 mass% of monoethylenic unsaturated monomer containing methacrylic acid alkylester having 1-4C alkyl, 5-65 mass parts of syrup containing 1-30 mass% of (co)polymer of monoethylenic unsaturated monomer unit, and 35-90 mass parts of polyfunctional (meth)acrylate. Especially, the polymerizable mixture comprises 30-65 mass% of monoethylenic unsaturated monomer and 35-70 mass% of polyfunctional (meth)acrylate monomer. Preferred Compound: The polyfunctional (meth)acrylate is represented by a compound of formula (1 or 2).R 1-R 3=H or CH 3;R 4 and R 5=H or 3C or less hydrocarbon; andn=0-4.Preferred Film: The transparent electroconductive film is an indium tin oxide film. Preferred Property: The transparent electrode board which is the upper or lower electrode board has load bending temperature of 150 degrees C or more. EXAMPLE - NK ester S-1800M (isostearyl methacrylate) (in mass parts) (10) and bis-oxymethyl tricyclo(5,2,1,0 2,6) (80) were mixed to form monomer mixture (100). 2,2'-azobis(2,4-dimethyl-4-methoxy valeronitrile) (0.05) as polymerization initiator, t-hexylperoxy isopropyl monocarbonate (0.05), t-hexyl peroxy component (0.5), and terpenolene (0.03) as polymerization modifier, were added to the monomer mixture. The content was stirred and degassed to obtain polymerizable blend. The blend was poured into a mold, which interposed gasket on a pair of tempered glass sheet at a space of 1.7 mm. The mold was kept in heating furnace and heated at 50 degrees C for 1 hour, 55 degrees C for 1 hour, and polymerized at 135 degrees C for 3 hours. The mold was cooled to 40 degrees C or less, and heated at 130 degrees C for 4 hours to obtain resin board having thickness of 1 mm. There was no crack formed on the board. The board was free of whitening or shrinkage cavity, and had good exterior. The board was transparent, and had haze of 0.2%. The load bending temperature of the board was more than 200 degrees C. The amount of residual monomer of dimethacrylate was 2.34 mass%.