A limited slip differential device has differential gears, a clutch to
limit the differential function of the differential gears, and a
electromagnetic solenoid including a plunger and a coil. The plunger is
set to move forward to engage the clutch by electromagnetic force of the
coil in a differential limit state and move backward by a return spring
to disengage said clutch in a differential limitless state. The plunger
contacts with a contacting member in at least one state of the
differential limit state and the differential limitless state, and their
contact area is set smaller than a facing area between them in at least
the one state.