Agent for promoting production and/or activity of casein and/or VEGF-C, and external preparation for skin using same

Provided are: an agent for promoting the production and/or activity of casein and/or VEGF-C, which contains, as an active ingredient, a compound represented by the following Chemical Formula 1 or a salt thereof (In Chemical Formula 1, each substituent is as defined in the description); and an external preparation for the skin, which contains the agent for promoting the production and/or activity of casein and/or VEGF-C. 提供一种络丝蛋白和/或VEGF-C的生产和/或活性促进剂及包含其的皮肤外用剂，其作为有效成分包含以下述化学式1表示的化合物或其盐，[化学式1]在所述化学式1中，各取代基如说明书中所定义。