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The present invention provides a method for producing bacterial cells, which comprises, in a multi-stage liquid culture process for bacteria, culturing a bacterium in a liquid medium containing an antibiotic in a stage prior to the final stage, and then lowering the concentration of the antibiotic in the final stage to a level lower than that in the prior stage. Accordingly, bacterial cells can be produced with good productivity while suppressing the appearance of variants forming abnormal colonies among the bacteria obtained after culture.