The object of the present invention is to provide a fatty acid composition whose fatty acid rate differs from that previously reported.The above object is achieved by a fatty acid composition obtained by culturing a host which is transformed with a recombinant vector carrying a nucleic acid comprising the nucleotide sequence of SEQ ID NO: 1 or a nucleotide sequence encoding a protein having the amino acid sequence shown in SEQ ID NO: 2 or a mutant functionally equivalent to the nucleic acid, wherein at least one or more of i) to v) shown below:i) the oleic acid contentii) the ratio of the oleic acid content to the palmitic acid contentiii) the ratio of the total content of stearic acid and oleic acid to the palmitic acid contentiv) the ratio of the total content of stearic acid and oleic acid to the total content of palmitic acid and palmitoleic acid andv) the n-6 fatty acid content is higher in the fatty acid rate of the fatty acid composition than in a cultured product obtained by culturing a host which is not transformed with the recombinant vector.
