Electromagnetic valve

An electromagnetic valve (10) comprising has a valve seat, a valve element movable relative to the valve seat (40) so as to open or close a hydraulic fluid passage interposed therebetween and a plunger (24) movable together with the valve element (30) relative to the valve seat (40), wherein the valve element (30) includes a sealing portion having an arc-shaped vertical cross section that contacts with the valve seat (40) and an expanding diameter portion having a diameter gradually increasing in a direction from the sealing portion toward the plunger (24).