A food or drink product with a disinfection property of Helicobacter pylori and/or a protection property against infection with H. pylori, comprising as the effective ingredient Lactobacillus gasseri OLL 2716 (FERM BP-6999) with a high disinfection potency of H. pylori. The food or drink product prepared by using the lactic acid bacterium, such as acid milk and the like, is suitable for long-term ingestion as a food or drink product with a disinfection property of H. pylori and/or a protection property against infection with H. pylori.