NOVELTY - A silicone resin base material (1) is obtained by molding binder (2) containing three dimensionally crosslinked silicone resin, and filler (3) containing alumina powder, magnesia powder, nitriding aluminum powder, nitriding boron powder, silicon nitride powder, graphite powder, carbon powder, aluminum powder, silver powder, iron powder, resin powder, barium titanate powder, titanium powder, silk, kaolin powder, brown-iron-oxide powder, zinc oxide powder, silica alumina powder, talc powder, glass fiber, carbon fiber and/or coloring agent.    USE - Silicone resin base material is used for LED substrate, semiconductor element substrate, integrated circuit (IC) substrate, high frequency substrate, electric circuit board, solar cell substrate and optical/electrical packages (all claimed).    ADVANTAGE - The silicone resin base material is hard and has high mechanical strength and excellent durability and is manufactured economically in high yield.    DETAILED DESCRIPTION - A silicone resin base material is obtained by molding binder containing three dimensionally crosslinked silicone resin, and filler containing alumina powder, magnesia powder, nitriding aluminum powder, nitriding boron powder, silicon nitride powder, graphite powder, carbon powder, silica powder, silicon carbide powder, boron-carbide powder, titanium carbide powder, mullite powder, diamond powder, copper powder, aluminum powder, silver powder, iron powder, resin powder, barium titanate powder, titanium powder, silk, kaolin powder, brown-iron-oxide powder, zinc oxide powder, silica alumina powder, talc powder, glass fiber, carbon fiber and/or coloring agent. The silicon resin is three-dimensionally crosslinked with silane coupling agent and siloxane compound. The silane coupling agent has unsaturated group added to unsaturated group or hydrosilyl group of siloxane compound.    DESCRIPTION OF DRAWING(S) - The drawing shows sectional view of silicone resin base material containing product.    Silicone resin base material (1)    Binder (2)    Filler (3)    Reflecting film layer (4)    Filter (5)    Silicon resin base material containing product (11)