To miniaturize an electromagnetic pump usable as an air pump or the like for a water tank without reducing pumping ability, and reduce vibration and noise coming out to the outside.

This electromagnetic pump is composed of a pump body part having a pumping chamber A formed of a pump frame 4 and a diaphragm 9, and an electromagnet 10. The pump frame 4 is provided with an inflow port 48 with a one-way valve 5 disposed, and an outflow port 4b with a one-way valve 7. The pumping chamber A is increased/decreased in displacement by the deformation of the diaphragm 9. The electromagnet 10 is provided with a movable iron core 15 axially reciprocated in an axial hole of a coil spool, and the diaphragm 9 is connected and fixed to the end part of the movable iron core 15. When electric power is supplied to the electromagnet 10, the movable iron core 15 is reciprocated, and the diaphragm 9 is deformed, and air is exhausted from an exhaust member 8 by the increase/decrease in displacement of the pumping chamber A.