<;P>;PROBLEM TO BE SOLVED: To provide a shelf life improver for food products, and to provide a method for improving the shelf life of the food products in which the seasoning and an improvement in the shelf life of the food products are simultaneously satisfied without deteriorating the flavor of the food products. <;P>;SOLUTION: The shelf life improver for the food products containing a fermentation seasoning liquid containing 20-59 wt.% of ethanol, a vitamin B1 salt, and an organic acid having an acid dissociation constant (pKa) of 3.5 to 4.5 is provided. <;P>;COPYRIGHT: (C)2009,JPO&INPIT