A steering assist device capable of appropriately reducing a steering load on a driver is provided. A steering assist device for assisting a steering operation of a driver who drives a vehicle, comprises: an auxiliary torque generation section for causing a steering device of the vehicle to generate an auxiliary torque that assists a steering force of the driver a first torque control section for controlling the auxiliary torque so as to cause the vehicle to perform turning in accordance with a curvature of a travel lane in which the vehicle travels a second torque control section for controlling the auxiliary torque so as to bring the position of the vehicle close to a center line of the travel lane a lane change determination section for determining whether or not the vehicle is performing lane change and a control suppression section for suppressing the control of the auxiliary torque by the second torque control section when it is determined that the vehicle is performing lane change.
