NOVELTY - The casting apparatus has a melting crucible (1a) which holds and melts silicon raw material (6) and carries out tapping from pouring hole (3) provided at bottom portion, a heating unit (4), a molten-metal pouring tube (2), a casting mold (7) and a spiral flow generation unit. Unit (4) heats material (6) in crucible, and set as silicon melt solution (5). Tube (2) is suspended and provided such that pouring hole covers outer side of crucible. Casting mold has release material (7a) provided inside tube (2) from downward direction.    USE - For casting high-quality polycrystalline silicon ingot (claimed) used for producing polycrystalline-silicon substrate used for solar cell element.    ADVANTAGE - The apparatus efficiently enables casting of polycrystalline silicon ingot with reduced product tampering amount, and prevents peeling of release material and mixing of foreign material with molten metal impact. The solar cell element using the polycrystalline-silicon substrate produced using the ingot, has high conversional efficiency.    DETAILED DESCRIPTION - The casting apparatus has a melting crucible (1a) which holds and melts silicon raw material (6) and carries out tapping from pouring hole (3) provided at bottom portion, a heating unit (4), a molten-metal pouring tube (2), a casting mold (7) and a spiral flow generation unit. Unit (4) heats material (6) in crucible, and set as silicon melt solution (5). Tube (2) is suspended and provided such that pouring hole covers outer side of crucible. Casting mold has release material (7a) provided inside tube (2) from downward direction. Spiral flow generation unit pours solution (5) into casting mold and generates spiral flow (F). An INDEPENDENT CLAIM is included for casting of polycrystalline silicon ingot.    DESCRIPTION OF DRAWING(S) - The figure shows the outline section drawing of the casting apparatus.    Melting crucible (1a)    Molten-metal pouring tube (2)    Pouring hole (3)    Heating unit (4)    Silicon melt solution (5)    Silicon raw material (6)    Casting mold (7)    Release material (7a)    Spiral flow (F)