NOVELTY - The method involves descending a coolant unit (10) towards a melting pot (3) containing silicon melt solution (4) to make the liquid level of the solution contact the base of a coolant unit. The solution is crystallized at the coolant base during which the coolant unit is raised.    DETAILED DESCRIPTION - A crystalline silicon material is contained in the melting pot whose temperature is controlled by a heater. The crystalline silicon material is heated and dissolved. The coolant unit is installed above the melting pot. During crystallization of the silicon melt solution, either the coolant unit is raised or the melting pot is descended. Alternatively, the ascending operation of the coolant unit and the descending operation of the melting pot can be performed simultaneously. The rotation of either the melting pot or the coolant unit is carried out. An INDEPENDENT CLAIM is also included for the manufacturing apparatus for polycrystalline silicon castings. The apparatus has a control unit to control the temperature of the heater. The temperature control of the surface of the coolant unit is carried out by a fluid for cooling. The coolant unit is composed of carbon or quartz which can withstand the melting temperature of the silicon. The base of the coolant unit has a notch portion to hold the growing polycrystalline silicon.    USE -   For cast articles made of polycrystalline silicon e.g. components of solar batteries.    ADVANTAGE -   Since the direction of crystal growth is fixed to the base of the coolant unit, crystal growth is complete and good. The polycrystalline silicon cast article with a smooth surface is obtained. There is no penetration of impurities from the casting mold, that is from the melting pot to the silicon casting. A mold release agent need not be used to release the silicon casting from the melting pot. The grain boundary defects in the polycrystalline silicon casting are reduced, and hence the solar battery having a high conversion efficiency is manufactured. The polycrystalline silicon casting is manufactured easily and the quality of the casting is good.    DESCRIPTION OF DRAWING - The figure shows the explanatory drawing of the manufacturing method of the polycrystalline silicon casting. (3) Melting pot; ; (4) Silicon melt solution; ; (10) Coolant unit.