A reaction method includes a reaction step of reacting two or more substances with each other by using a pipette tip (A), attached to a pipette nozzle (B), for sucking or discharging a liquid to supply a liquid to a reaction field and remove the liquid from the reaction field a plurality of times. The reaction method further includes: a first process of, prior to the reaction step, detecting an end height of the pipette tip (A) and setting a reference height of the pipette nozzle (B) on the basis of the end height of the pipette tip (A); and a second process of correcting, in a course of the reaction step, the height of the pipette nozzle (B) from the reference height so as to cancel out variation in the end height of the pipette tip (A) due to a change in the temperature of the pipette tip (A).
