To provide a pump device using a Hall element which senses the magnetic force of a magnet reciprocating, capable of grasping accurately the pump operating situation through control of a circuit board.

The pump device is composed of a magnetic moving element 2 furnished with a check valve 7 at the inlet where fluid passages 5a and 6a spreading tapering are formed on both sides of a penetrating passage 3a of a cylindrical magnet 3 magnetized in the axial direction; a cylinder 9 furnished with peripheral magnetic pieces 15 and 15a curving in the form of two moon halves located outside in such a way as pinching the cylinder 9, formed through such procedures that the magnetic moving element is accommodated slidably, on both sides thereof springs 8 and 8a are arranged, a suction nozzle 10 is installed at the inlet while a discharge nozzle 11 fitted with a check valve 12 is installed at the outlet, and that two drive coils 13 and 13a are wound around the periphery; and the circuit board 16 accommodated together with the cylinder in cases 17 and 17a for sensing the driving situation with the Hall element 14 by reciprocating the magnetic moving element, wherein an AC current is impressed including a division not flowing the current in the current waveform so that the same poles face confront the two drive coils.