Damping force variable valve assembly and damping force variable shock absorber including the same

The present disclosure relates to a damping force variable valve assembly and a damping force variable shock absorber including the same, in particular to a damping force variable valve assembly which can maintain a damping force at a medium level by maintain a valve core position on a fault position during fault of as olenoid. The damping force variable valve assembly is installed in a damping force variable shock absorber for adjustment of a damping force of the shock absorber, includes at least: a solenoid that generates a magnetic force when an electric current is supplied thereto; a plunger configured to be moved by the magnetic force of the solenoid; a spool that is moved together with the plunger and change a damping force between a hard mode and a soft mode by changing an inner passage of the damping force variable valve assembly; and a spool position determination member that locates the spool at a fail position, which does not correspond to the hard mode and the soft mode, so as to maintain the damp