This microneedle device is provided with: a substrate； microneedles that are arranged on the substrate； and a coating layer that is formed on the microneedles. The microneedles have a length of 300-500 [mu]m； the microneedles are arranged on the substrate at a density of 28-80 microneedles/cm2； and the coating layer comprises a biologically active substance. This microneedle device is capable of reducing skin irritation that is caused by administration of a medical agent.本發明之微針裝置具備基板、配置於基板上之微針、及形成於微針上之塗層，且微針之長度為300～500 μm，微針以28～80支/cm2之密度配置於基板上，塗層具有生理活性物質。根據該微針裝置，可減少因藥劑投予導致之皮膚刺激。
