Provided is a probiotics preparation that has high immunostimulatory activity, has extremely high stability as a viable bacterium, and is also excellent in productivity. A strain belonging to a sporophytic lactic acid bacterium Wizmania coagulans that promotes IgA and IFN-gamma production, a mutant, a crushed product, a culture, an extract of the strain, A lactic acid bacterium preparation that promotes production of IgA and IFN-gamma in vivo, which comprises a processed product thereof; and Wizmania coagulans SANK70258 is preferable as the sporogenic lactic acid bacterium Wizmania coagulans. Figure 1
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