NOVELTY - A thin silicon-type solar cell module has thin-film solar cell (J) having bus region, transparent insulated substrate (I), layers containing transparent electrode layer (H), photovoltaic thin-film semiconductor layer (G) and back surface electrode layer (F), and photovoltaic device, sealing unit with back surface protective cover film (A1) and filler (C), connection unit, wiring (D), and small-sized polyisobutylene-type sealing material sheet (B1) including inorganic filler(s) chosen from silica gel, alumina, zeolite and talc, and polyisobutylene and having thickness of 0.1-0.7 mm.    USE - Thin silicon-type solar cell module. Uses include but are not limited to rooftop of building, factory, school, public facility and desert.    ADVANTAGE - The thin silicon-type solar cell module has excellent moisture resistance, and favorable workability. In the solar cell module, clearance gap between small-sized polyisobutylene-type sealing material sheet and internal wiring material, and adhesiveness between back surface protective cover film and sealing material sheet are improved.    DETAILED DESCRIPTION - A thin silicon-type solar cell module has a thin-film solar cell (J) having transparent insulated substrate, on which layers including a transparent electrode layer, a photovoltaic thin-film semiconductor layer and a back surface electrode layer are sequentially formed, photovoltaic device segmented into regions electrically connected in series, and a bus region in which electric power is brought together as termination of serial connection, sealing unit containing a back surface protective cover film and filler which protects surface in which thin-film solar cell is formed, connection unit for supplying outside electric power generated by thin-film solar cell, wiring which ties the connection unit and bus region, and opening provided on the back surface protective cover film. In thin silicon-type solar cell module, small-sized polyisobutylene-type sealing material sheet is provided, such that opening of back surface protective cover film is covered completely. The transparent insulated-substrate, transparent electrode layer, photovoltaic thin-film semiconductor layer, back surface electrode layer, filler, small-sized polyisobutylene-type sealing material sheet and back surface protective cover film are sequentially laminated around the opening. In region which overlaps with the opening, wiring is provided in groove which is led outside with small-sized polyisobutylene-type sealing material sheet, and contacts with the wiring. The small-sized polyisobutylene-type sealing material sheet has thickness of 0.1-0.7 mm and includes inorganic filler(s) chosen from silica gel, alumina, zeolite and talc, and polyisobutylene. The back surface protective cover film has a primer layer as outermost layer of side which contacts the small-sized polyisobutylene-type sealing material sheet.    DESCRIPTION OF DRAWING(S) - The drawing shows schematic view of the thin silicon-type solar cell module.    Back surface protective cover film (A1)    Small-sized polyisobutylene-type sealing material sheet (B1)    Filler (C)    Wiring (D)    Back surface electrode layer (F)    Photovoltaic thin-film semiconductor layer (G)    Transparent electrode layer (H)    Transparent insulated substrate (I)    Solar cell (J)