NOVELTY - The apparatus (101) has a cooling unit that cools the crucible (103) which accommodates a silicon raw material (102). A heater (104) is arranged around the crucible, and a heat conductor (106) is provided under the crucible. The heat conductor is comprised with a bottomed cylindrical structure and opened in downward direction. The bottom portion outer surface of the conductor is arranged opposing the bottom portion outer surface of the crucible so that opening edge vicinity of the conductor is cooled by the cooling unit.    USE - Apparatus for manufacturing polycrystal silicon ingot for base material of solar cell.    ADVANTAGE - The amount of heat removal from the crucible is performed appropriately during manufacture of the polycrystal silicon ingot. Hence, temperature control efficiency of the manufacturing apparatus is improved and quality of the polycrystal silicon is improved while reducing crystal defects.    DETAILED DESCRIPTION - The heat conductor operates at 25 degrees C based on flash method of JIS R1611 and has a heat conductivity of 30-150 W/masteriskK. The heat conductor is made of graphite. An induction heating coil (113) heats the heat conductor and upper and lower heat insulating material (112,114) cover a portion of the heat conductor. A lid (109) covers the opening edge of the crucible, and a nozzle (111) blows an inert gas into the crucible. An INDEPENDENT CLAIM is included for a method for manufacturing polycrystal silicon ingot, involves accommodating silicon raw material in crucible whose temperature is controlled and heating silicon raw material in crucible to a temperature beyond melting point of silicon. The molten silicon is cooled in crucible through heat conductor arranged under the crucible to obtain a polycrystal silicon ingot. The temperature of bottom portion outer surface of the heat conductor is set to specific value. The heating and cooling processes are performed in inert gas atmosphere.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of the polycrystal silicon ingot manufacturing apparatus.    Polycrystal silicon ingot manufacturing apparatus (101)    Silicon raw material (102)    Crucible (103)    Heater (104)    Heat conductor (106)    Lid (109)    Nozzle (111)    Upper heat insulating material (112)    Induction heating coil (113)    Lower heat insulating material (114)