To provide a casting method of a polycrystalline silicon ingot by which the loss of a molten metal is reduced when an assemble system casting mold exhibiting high cost merit is used, a polycrystalline silicon ingot attaining both of high quality and low cost, a polycrystalline silicon substrate and a solar cell element using the same.

The casting method of the polycrystalline silicon ingot includes a pouring step for pouring a molten silicon 4 obtained by melting silicon to the casting mold 5 formed by assembling a plurality of members to be partially opened at one part from the opening part of the casting mold 5 and a solidifying step for solidifying the molten silicon 4 while keeping it in the casting mold 5. In the pouring step, gaps 10 among the plurality of the members constituting the casting mold 5 are sealed by an initial solidified layer 11 formed by solidifying the molten silicon 4 being brought into contact with the inner surface of the casting mold 5.

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