An electromagnetic valve comprises a case having a cylindrical portion, a yoke having a large diameter portion and a small diameter portion, and a sleeve having at least two ports and receiving a valve member therein so as to perform reciprocating motion. The large diameter portion of the yoke is fluid-tightly pressed into the inner circumferential surface of the cylindrical portion of the case, and the inner circumferential surface of the sleeve is fluid-tightly pressed onto the outer circumferential surface of the small diameter portion of the yoke.