The present invention provides a microneedle device having a coating, which is effective even with a low molecular weight active compound and can sustain the effect of the drug for a long period of time, and a transdermal drug administration apparatus with microneedles. The microneedle device (5) has, on a microneedle substrate (8), a plurality of microneedles (6) that can pierce the skin, wherein the surface of the microneedles (6) and/or the microneedle substrate (8) is partly or entirely coated in fixed state with a coating carrier containing polyvinyl alcohol. The polyvinyl alcohol preferably has a hydrolysis degree of 94.5 mol% or more. Furthermore, the coating carrier can contain a drug.
