To provide microalgal recombinant strains with improved productivity of triacylglycerol, a potential biofuel raw material, and methods for producing triacylglycerol.SOLUTION: The invention relates to a microalgal recombinant strain in which a gene encoding an FAX1 protein having a homology to a chloroplast inner envelop protein AtFAX1 first found in Arabidopsis thaliana, is overexpressed, where triacylglycerol accumulation in the recombinant strain is increased as compared with the wild type strain, and the protein has an amino acid sequence having at least 25% sequence homology to AtFAX1 and functions in membrane transport of fatty acids.SELECTED DRAWING: Figure 6
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