An embodiment of the present invention relates to a salty taste enhancer containing an amino acid and/or a derivative thereof, the amino acid being L-leucine, or L-leucine and L-isoleucine. At least one embodiment provides: (i) a salty taste enhancer which is capable of effectively enhancing a salty taste of food or drink, (ii) food or drink containing the salty taste enhancer, and/or (iii) a method for producing the food or drink.