The use of probe arrays in which probes of various biological substances such as DNA are immobilized on the surface of a solid is becoming established as an effective means for high-speed screening. Different kinds of probes, such as DNA, are immobilized on the surface of a multiple number of independently treatable fine particles, such as beads, instead of the surface of a single solid, and the resulting beads are aligned in a capillary or a cell in a designated order. The size of the area where one probe is immobilized is reduced. The bead probe array is characterized in that such small beads are aligned one by one in a designated manner using a sheet with holes, and one or a multiple number of beads are held in the holes and then transferred to a probe array holder such as a capillary.