Nucleating agent consisting of a metal salt of an aromatic ester of phosphoric acid having an average length on its axis greater than 10 µm or less, a ratio between dimensions of 10 or less or an apparent density of at least 0.1 , said metal salt being represented by the following formula (I): (See formula) (in which R1 represents a C4-C8 alkyl group, R2 represents a hydrogen atom or a C1-C8 alkyl group, R3 represents a C1 alkylidene group -C4, A represents a metal that has a valence of n, and n is an integer value of 1 or 2).
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