Electromagnetic valve

An electromagnetic valve (OV) has: a coil unit (14) including a bobbin (12) around which a coil winding (13) is wound, the bobbin (12) having a central hole (12a); a pipe body (16) in which a fixed core (17) is press-fitted and welded; and a valve operating unit with the pipe body (16) inserted in the central hole (12a) of the bobbin (12) at an one end thereof, a valve (32) of the valve operating unit being opened or closed when the coil unit (14) is energized, wherein, in an inserted portion of the pipe body opposed to the central hole (12a) of the bobbin (12), a welding portion (19) in which a fixed core (17) is welded is formed in a thin-wall sectional shape reduced only an outer diameter thereof, and a difference (t) in the outer diameter between the welding portion and the inserted portion serves to absorb the swelling of a bead due to the welding.