Provided are a nerve growth inhibitor and a cutaneous-sensory-irritation inhibitor, with which dermal hyperesthesia and nerve extension based on newly found nerve extension mechanisms can be effectively inhibited. This nerve growth inhibitor or cutaneous-sensory-irritation inhibitor comprises one or more selected from: (1) a specific flavonoid； (2) a tannin； (3) chlorogenic acid； (4) a specific stilbenoid； and a glycoside or a pharmaceutically acceptable salt of (1)-(4)； or (5) a specific crude drug extract； and (6) a walnut polyphenol.
