NOVELTY - The apparatus (10) has a crucible (20) whose horizontal cross section is formed in a rectangular shape. A top heater (43) is arranged above the crucible. A lower heater (33) is arranged below the crucible. A space heater (50) is provided on bottom face (21) of the crucible to heat at least a portion among the side wall portions (22) of the crucible. The length along bottom face of center region is in the range of 0.3L-0.7L with respect to full length of side wall portions. The height of space heater is in the range of 0.1HP-0.3HP with respect to height of crucible.    USE - Manufacturing apparatus of polycrystal silicon ingot (claimed) for manufacture of polycrystal silicon wafer used as substrate for solar cell.    ADVANTAGE - The production yield of the polycrystalline silicon ingot can be improved.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacturing method of polycrystal silicon ingot involves melting the silicon raw material inserted in crucible, and producing the silicon melt solution (3). The lower heater is stopped. The temperature difference of up-down direction is given with respect to the silicon melt solution stored in the crucible. The silicon melt solution stored in the crucible is assigned to upper direction where unidirectional solidification is performed from the bottom face side of the crucible. A portion of the side wall portion of the crucible is heated using the space heater. The height of initial stage region is in the range of 0.3HM with respect to molten-metal surface height of the silicon melt solution stored in crucible. The rectangular surface is 550 mm or more in length. The cross section of bottom portion of the polycrystal silicon ingot contacting the bottom face of the crucible is 50mm. The oxygen concentration in the center portion of the rectangular surface is below 510173 atm/cm.    DESCRIPTION OF DRAWING(S) - The drawing shows an explanatory view of the polycrystal silicon ingot manufacturing apparatus.    Silicon melt solution (3)    Manufacturing apparatus (10)    Crucible (20)    Bottom face (21)    Side wall portion (22)    Lower heater (33)    Top heater (43)    Space heater (50)