The goal of the present invention is to provide a sense-improving agent that is safe and has the effect of improving dulling of peripheral senses by routine consumption or application to the skin. Another goal of the present invention is to provide a food and beverage product, feed, and cosmetic product for improving senses that have the effect of improving peripheral senses by oral ingestion or application to the skin. A sense-improving agent is provided that uses a milk-derived protein and/or milk-derived protein decomposition product as the active ingredient. The milk-derived protein and/or milk-derived protein decomposition product is capable of improving dulling of the senses, particularly the peripheral senses, and can be used in a food and beverage product, feed, or cosmetic for improving the senses.
