The invention provides an electromagnetic valve which can suppress events that damage magnetic characteristic of a fixed iron core, and a forming method of an insulative coating film which is arranged on the fixed core. The forming method of the insulative coating film which is arranged on the fixed iron core comprises the steps of accommodating the fixed iron core (32) in a mold (50); while pressing the outer end surface of a first flange (41) to the mold (50), ejecting molten resin into the mold (50) on condition that at least one in outer peripheral surfaces which clamp a shaft part (40) and are arranged at two sides in the first flange (41) and the second flange (42) contacts with the mold (50).