In this study, we developed an electromagnetically driven micropump with a magnetic fluid seal, which greatly contributes to the miniaturization of medical analytical sensor systems. The magnetic fluid seal applied to this micropump prevented the solution from entering the inside of the thrust bearing attached to the gap between the liquid feed rotor and the stator, and the abrasion powder generated from the bearing was prevented from being mixed into the solution. Furthermore, because the liquid feed rotor was rotated in a noncontact manner by the electromagnetic force from the coil attached to the external pump, continuous feeding of liquid with reduced pulsation was possible. When the rotational speed of the liquid feed rotor was 500 rotations per minute, the feed rate of pure water was 2 ml/min. At this rotational speed, there was no pure water intrusion into the thrust bearing nor separation of the magnetic fluid from the neodymium magnet. This result indicates that the magnetic fluid seal for the thrust bearing is effective. The micropump developed is a device that can be integrated with a biosensor chip, thereby contributing to the realization of a compact medical analysis sensor system that can be easily operated beside a patient.