To reduce pulsation in a discharged fluid.

An electromagnetic pump 1 comprises an magnetic rod 8 excited by applying a pulse current to an electromagnetic coil, an electromagnetic plunger 25 reciprocating with excitation and demagnetization of the magnetic rod 8, a piston 31 driven by the electromagnetic plunger 25, a pump chamber 37 for sucking and compressing the fluid by the piston 31, and a fluid passage for leading the compressed fluid in the pump chamber 37 to a discharge hole 52, wherein an orifice 20 is formed in the downstream side of the electromagnetic plunger 25 in the fluid passage.