Organic compound crystal

Patent Pending PROBLEM TO BE SOLVED: To provide a method for producing an organic compound crystal, capable of optionally controlling crystalline form to be crystallized, corresponding to purpose and use. ; SOLUTION: The method for producing organic compound crystal comprises mixing an organic compound solution dissolved the organic compound in a good solvent, with a poor solvent containing the organic compound of the desired crystalline form to prepare the crystal of the same crystalline form as the contained in the poor solvent.