NOVELTY - The tool (1) has a main metal fitting (2) that integrally forms a support portion (7) for supporting a solar cell panel. A plate-shaped collar portion (8) is extended outwards from lower edge of support portion and fixed to foundation (B) of rooftop by a tapping screw (6). A lower non-vulcanized butyl rubber sheet (4) is located between metal fitting and foundation. An upper non-vulcanized butyl rubber sheet (3) is attached to the foundation so that the outer periphery edge of collar portion and insertion portion (10) of the screw are covered.    USE - Object fixing tool for installing solar cell panel in rooftop of building. Can also be used in installing air conditioning machine and antenna.    ADVANTAGE - The object fixing tool can be constructed easily at low cost and the water leakage from the installation can be prevented. The object fixing tool can be fixed firmly to the slab concrete by using a nylon plug and adhesion surface area of the collar portion can be increased to improve water tightness of the fixing tool. Sufficient waterproof performance can be exhibited even if the clearance gap is produced between collar portion and lower non-vulcanized butyl rubber sheet. The water leakage from screw penetration hole can be prevented as the upper non-vulcanized butyl rubber sheet is attached to the foundation. By diluting the non-vulcanized rubber with the solvent and locating the rubber between the foundation and lower rubber sheet, the contact degree of the rubber sheets can be improved. The expansion and contraction of the adhesion object can be tracked easily as the non-vulcanized butyl rubber sheets are flexible. The plate-shaped collar portion is adhered to the lower rubber sheet so that the air pocket is prevented from escaping and remains in a joint surface to the hollow portion via the groove. The resin coating to the metal fitting is not necessary so that crack or fracture in the rubber sheets when the rubber sheet adheres directly to the foundation can be avoided.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the object fixing tool.    Object fixing tool (1)    Main metal fitting (2)    Non-vulcanized butyl rubber sheets (3,4)    Tapping screw (6)    Support portion (7)    Plate-shaped collar portion (8)    Insertion portion (10)    Foundation (B)