To provide a crushing method simply crushing a large amount of polycrystalline silicon cast chips consisting of columnar structure cast by one-way solidification into desired particle sizes with a preferable yield, causing little contamination in crushing, and easy to remove contamination in crushing.

In this crushing method of polycrystalline silicon, at least one face among six surfaces 6 of rectangular parallelepiped polycrystalline silicon cast chips by one-way solidification is crushed after cutting in one or more slits in the direction not crossing the growing direction of the columnar structure formed by one-way solidification.

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