NOVELTY - An alloy element is added and dissolved in a silicon raw material containing impurities, and eutectic reaction of silicon element in raw material is carried out to obtain silicon alloy molten metal having high silicon concentration with respect to eutectic composition. The silicon alloy molten metal is coagulated by unidirectional solidification and the obtained ingot is drawn. The additional supply of silicon raw material to silicon alloy molten metal is carried out such that silicon element consumed by coagulation process is supplemented, to obtain silicon ingot.    USE - Manufacture of silicon ingot used for growing silicon polycrystal or single crystal (claimed) for semiconductor device used for solar cell module for electric power generation system.    ADVANTAGE - The method enables easy, reliable and stable manufacture of silicon ingot, without environmental pollution. The silicon polycrystal or single crystal having high purity is manufactured using the silicon ingot.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) apparatus (10) for manufacturing silicon ingot, which has crucible (14) in which alloy element is added to silicon alloy molten metal, a partition portion (18) comprising a communicating hole (19) through which silicon alloy molten metal passes, and is provided in the crucible such that crucible is divided to region (14A) and region (14B), a draw-out unit to continuously draw out ingot in region (14A), a batch feeder to carry out additional supply of silicon raw material to silicon alloy molten metal in the region (14B), and injected-quantity control portion which computes silicon concentration of silicon alloy molten metal accommodated in the crucible and adjusts the injected quantity of silicon raw material from batch feeder with respect to computed silicon concentration; and    (2) method used for growing silicon polycrystal or single crystal, which involves growing crystal from silicon alloy molten metal by Czochralski method.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of the apparatus for manufacturing silicon ingot.    Apparatus for manufacturing silicon ingot (10)    Crucible (14)    Regions (14A,14B)    Partition portion (18)    Communicating hole (19)