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1. A steering control device configured to control, as an object of control, a steering system including a reaction force motor that applies a steering reaction force to a steering shaft and a turning motor that turns a turning wheel in a state where power transmission from the steering shaft is cut off, the steering control device comprising a processor configured to execute reaction force setting processing, reaction force application processing, axial force gradient calculation processing, and interlocking processing, wherein the reaction force setting processing is processing of setting the steering reaction force using phase compensation processing, the reaction force application processing is processing of operating the reaction force motor with a reaction force set by the reaction force setting processing as input thereto, the phase compensation processing is processing of performing phase compensation on the steering reaction force, the axial force gradient calculation processing is processing of calculating an axial force gradient, the axial force gradient is a variable indicating a ratio of a change in resisting force against rotation of the steering shaft to a change in rotation angle of the steering shaft, the interlocking processing is processing of changing one of both a value of a phase compensation regulation variable and the axial force gradient according to the other, and the phase compensation regulation variable is a variable that regulates a manner of the phase compensation.
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