<;P>;PROBLEM TO BE SOLVED: To provide a microneedle array including a microneedle easily piercing the skin surface layer and/or the skin keratin layer, and dissolved to disappear in the skin surface layer and/or the skin keratin layer after being pierced. <;P>;SOLUTION: In the microneedle array, fine needle-like microneedles are formed on the surface of a base plate. The microneedle contains 60-90 wt.% high molecular weight hyaluronic acid with a weight average molecular weight of 400,000 or more, and 40-10 wt.% low molecular weight polymer with a weight average molecular weight of 50,000 or less. <;P>;COPYRIGHT: (C)2010,JPO&INPIT