A steering control unit for controlling a steering system, the steering system having a first structure or a second structure, the first structure being such that a steering input device that receives a steering input is mechanically separated from a steering operation device that steers a steered wheel in accordance with the steering input, the second structure being such that the steering input device is selectively mechanically coupled and decoupled to and from the steering operation device, the steering control unit comprising: a control circuit that controls actuation of a steering-side motor that supplies the steering input device with a steering reaction force that opposes the steering input; wherein the control circuit includes an end reaction force calculation circuit, characterized in that the control circuit includes at least one additional reaction force calculation circuit, and a reaction force selector circuit, wherein when a steering angle (θh) of a steering wheel coupled to the steering input device exceeds a steering angle threshold (θie) that is set according to the steering system, the end reaction force calculation circuit calculates an end reaction force (Fie) that increases the steering reaction force on a basis of a first condition that indicates an increase in absolute value of the steering angle (θh), the at least one additional reaction force calculation circuit calculates at least one additional reaction force (Fo) that increases the steering reaction force on a basis of a second condition different from the first condition, the reaction force selector circuit selects one reaction force with a greatest absolute value from the end reaction force (Fie) and the at least one additional reaction force (Fo), and the control circuit calculates target reaction torque (Ts*) as a target value for the steering reaction force by taking into account the reaction force selected by the reaction force selector circuit. a control circuit that controls actuation of a steering-side motor that supplies the steering input device with a steering reaction force that opposes the steering input; wherein the control circuit includes an end reaction force calculation circuit, characterized in that the control circuit includes at least one additional reaction force calculation circuit, and a reaction force selector circuit, wherein when a steering angle (θh) of a steering wheel coupled to the steering input device exceeds a steering angle threshold (θie) that is set according to the steering system, the end reaction force calculation circuit calculates an end reaction force (Fie) that increases the steering reaction force on a basis of a first condition that indicates an increase in absolute value of the steering angle (θh), the at least one additional reaction force calculation circuit calculates at least one additional reaction force (Fo) that increases the steering reaction force on a basis of a second condition different from the first condition, the reaction force selector circuit selects one reaction force with a greatest absolute value from the end reaction force (Fie) and the at least one additional reaction force (Fo), and the control circuit calculates target reaction torque (Ts*) as a target value for the steering reaction force by taking into account the reaction force selected by the reaction force selector circuit.