NOVELTY - A dye-sensitized solar cell comprises a Photoelectrode (1), a counter electrode (9) having conductive layer (7), and an electrolyte layer (6) interposed between the photoelectrode and counter electrode. The photoelectrode comprises a porous transparent conductive layer (3) and a pigment (5)-adsorbed metal oxide semiconductor layer (4) sequentially laminated on hard transparent substrate (2,8). The hard transparent substrate is formed by hardening a silicone resin containing cage-type structured polyorganosilsesquioxane (1) as main component.    USE - Dye-sensitized solar cell.    ADVANTAGE - The lightweight dye-sensitized solar cell has improved conversion efficiency, workability, durability, heat resistance and light resistance. The hard transparent substrate provided in dye-sensitized solar cell has excellent transparency, heat resistance, flexibility and dimensional stability, and high toughness.    DETAILED DESCRIPTION - A dye-sensitized solar cell comprises a photoelectrode, a counter electrode having conductive layer, and an electrolyte layer interposed between the photoelectrode and counter electrode. The photoelectrode comprises a porous transparent conductive layer and a pigment-adsorbed metal oxide semiconductor layer sequentially laminated on a hard transparent substrate. The hard transparent substrate is formed by hardening a silicone resin containing cage-type structured polyorganosilsesquioxane of formula: (RSiO1.5)m(RSiO0.5)n (1) as main component.    R=-R1-OCO-CR2=CH2, -R1-CR2=CH2, -CH=CH2, alkyl, cycloalkyl, cycloalkenyl, phenyl, H, alkoxy or alkyl siloxy, where several R are mutually different;    R1=alkylene, alkylidene or phenylene;    R2=H or alkyl;    m=8-16;and    n=0-4.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of dye-sensitized solar cell.    Photoelectrode (1)    Hard transparent substrates (2,8)    Transparent conductive layers (3,7)    Metal oxide semiconductor layer (4)    Pigment (5)    Electrolyte layer (6)    Counter electrode (9)