<;P>;PROBLEM TO BE SOLVED: To provide a lactic acid bacterium preparation containing a new microorganism of the genus Lactobacillus, having good adhesiveness and fixability in the digestive tract, having prophylactic and therapeutic effect for diarrhea and colic and probiotic effect such as stress reduction effects. <;P>;SOLUTION: The lactic acid preparation contains a microorganism of the genus Lactobacillus identified as Lactobacillus sp. KBL13 strain or ST18 strain having the stress reduction effects. <;P>;COPYRIGHT: (C)2008,JPO&INPIT