The device uses a dispensing probe; a dispensing probe drive mechanism having at least one rotation drive shaft as a horizontal drive mechanism for the dispensing probe, a positioning member with a portion, which is contacted by the dispensing probe during positioning, is formed in a circular shape; a contact detection mechanism for detecting contact between the dispensing probe and the positioning member, and a control unit. The control unit drive-controls only one drive shaft into contact with the circular portion of the positioning member, and then drive-controls only one drive shaft other than the previously drive-controlled shaft into contact with the circular portion of the positioning member, and then calculates position information on a center point at a desired position where the dispensing probe is to be positioned, on the basis of position information on each point at which the contact has been detected, or the like.