1. A steering control device comprising: a steering operating unit arranged to be steered through a plurality of different steering motions; and a control unit which performs steering control of a vehicle through a plurality of steering operation systems corresponding to the plurality of steering motions on a basis of an input value input by each of the plurality of steering motions, wherein, when adjusting a reference point of a steering motion in at least one steering operation system from among the plurality of steering operation systems, the control unit reduces a control amount in at least one steering operation system from among steering operation systems other than the steering operation system where the reference point is adjusted.