A novel crystalline polymorphic form of ulipristal acetate useful as an agent for preventing and/or treating uterine leiomyoma and as a contraceptive, and a process for producing the crystalline polymorphic form are provided. The novel crystalline polymorphic form of ulipristal acetate is obtained by crystallization or transition in association with a specified solvent. The solvent comprises at least one member selected from the group consisting of water, an aliphatic hydrocarbon, an aromatic hydrocarbon, a halogenated hydrocarbon, a linear alcohol, an alkyl ether, an acetate ester, an alkyl ketone, an N-alkylacylamide, and an alkanenitrile.
