A linear solenoid valve includes a solenoid having a coil wound around a
coil bobbin, a fixed core, and a movable core for being attracted to the
fixed core when the coil is energized, and a valve mechanism having a
valve element for selectively bringing an inlet port and an outlet port
into and out of fluid communication with each other responsive to a
displacement of the movable core. The movable core has a nonmagnetic
layer formed on an outer surface thereof and having a predetermined
thickness.