To provide a microarray on which the spot shape of a probe DNA to be immobilized can be formed simply and surely in a desired shape.

The microarray 2 which uses a slide glass as a substrate is provided with hydrophilic regions 3 whose surface is hydrophilic and to which the probe DNA is immobilized and a hydrophobic region 4 to which the probe DNA around them is not immobilized and whose surface is hydrophobic. When a solution containing the probe DNA is dropped by a spotter 5, the solution is spread to the hydrophilic region 3, and it is restrained from being spread further by the hydrophilic region 4. As a result, the shape of spots as the hydrophilic regions 3 can be decided arbitrarily.