NOVELTY - A gas floating apparatus having an upward open divergence cone portion (11), a downward open convergence cone portion (12), throat portion (13), and a gas supply section (14) is provided. A raw material (30) having aspect ratio of 1:1-1:4 and capable of forming spherical molten crystal grain is supplied. The raw material of floating state is heated with non-contact heating apparatus (41), and melted. The thermal output of heating apparatus is lowered, and raw material is solidified to manufacture spherical silicon particles (32).    USE - Manufacture of spherical silicon particles used for solar cell, IC substrate and light multiplication apparatus.    ADVANTAGE - The spherical silicon particles having high sphericity degree and purity are manufactured by a compact installation.    DETAILED DESCRIPTION - A gas floating apparatus having an upward open divergence cone portion, a downward open convergence cone portion, throat portion formed in connecting portion of cone portions, and a gas supply section connected under convergence cone portion and supplying floating gas from convergence cone portion to divergence cone portion is provided. A raw material having aspect ratio of 1:1-1:4 and capable of forming spherical molten crystal grain with size less than internal diameter of throat portion is supplied. The raw material of floating state is heated with non-contact heating apparatus, and melted. The thermal output of heating apparatus is lowered, and melted raw material is solidified to manufacture spherical silicon particles. An INDEPENDENT CLAIM is included for manufacturing apparatus of spherical silicon particles (50), which has the gas floating furnace, material supply apparatus and non-contact heating apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of gas floating furnace.    Divergence cone portion (11)    Convergence cone portion (12)    Throat portion (13)    Gas supply unit (14)    Raw material (30)    Spherical silicon particles (32)    Heating apparatus (41)    Manufacturing apparatus (50)