A microelectrofluidic device includes: a chamber; a first fluid and a second fluid which are contained in the chamber and are not mixable with each other; and a first electrode group including a plurality of electrodes that are disposed on an inner side of the chamber, and to which a voltage is applied to change an interface between the first fluid and the second fluid, wherein the plurality of electrodes are connected to form a first electrode unit, a second electrode unit, and a third electrode unit that are independently turned on or off, and the plurality of electrodes are annular and coated with an insulating material, and adjacent electrodes are connected to different electrode units.