The array 1 with microprojections includes a substrate 2 and tapered microprojections 3 that are provided on the substrate 2 and become narrower from the bottom toward the tip. The distance from the tip portion to the bottom portion on an arbitrary side surface of the microprojection 3 is defined as a, and the length of the second line segment obtained by projecting the first line segment indicating the distance a onto the substrate 2 is defined as b. In this case, the relationship of 1.0 <；(a / b) ≦ 7.5 is established.微小突起付きアレイ１は、基板２と、その基板２に設けられ、底部から先端部に向けて細くなるテーパ状の微小突起３とを備えている。微小突起３の任意の側面における先端部から底部までの距離をａとし、その距離ａを示す第１の線分を基板２上に投影してなる第２の線分の長さをｂとした場合に、１．０＜（ａ／ｂ）≦７．５の関係が成立する。
