The present invention provides a microneedle device which is provided with a substrate, a microneedle that is arranged on the substrate, and a coating layer that is formed on the microneedle. The coating layer contains a biologically active substance, arginine and glycerin.本發明提供一種微針裝置,其係具備基板、配置於基板上之微針、及形成於微針上之塗覆層之微針裝置,其中塗覆層含有生理活性物質、精胺酸及甘油。