A regenerative brake control system comprising: an electric motor; at least one of an accelerator sensor, a front brake sensor, a regeneration amount sensor, a regenerative mode sensor, a clutch sensor, a foot brake sensor, a rotational speed sensor, and a vehicle speed sensor, for detecting a vehicle state; and a control unit which sets regenerative torque of the electric motor; wherein the control unit sets target regenerative torque which is a target value of output torque to be generated by the electric motor and is a negative value, based on the vehicle state detected by the at least one of the sensors, when a regeneration condition which is a condition required to shift the electric motor to regenerative running is satisfied, characterised in that when an asymptotic control condition which is a condition required to perform asymptotic control for a torque command provided to the electric motor is satisfied, the control unit performs the asymptotic control in such a manner that the torque command provided to the electric motor gets gradually close to the target regenerative torque with a passage of time, wherein when the asymptotic control condition is not satisfied, the control unit immediately provides the target regenerative torque as the torque command to the electric motor, wherein the control unit performs the asymptotic control when a difference between a value of torque output from the electric motor and a value of the target regenerative torque is larger than a predetermined value, and wherein the control unit provides the torque command equal to the target regenerative torque immediately when the difference between the value of the torque output from the electric motor and the value of the target regenerative torque is smaller than the predetermined value. an electric motor; at least one of an accelerator sensor, a front brake sensor, a regeneration amount sensor, a regenerative mode sensor, a clutch sensor, a foot brake sensor, a rotational speed sensor, and a vehicle speed sensor, for detecting a vehicle state; and a control unit which sets regenerative torque of the electric motor; wherein the control unit sets target regenerative torque which is a target value of output torque to be generated by the electric motor and is a negative value, based on the vehicle state detected by the at least one of the sensors, when a regeneration condition which is a condition required to shift the electric motor to regenerative running is satisfied, characterised in that when an asymptotic control condition which is a condition required to perform asymptotic control for a torque command provided to the electric motor is satisfied, the control unit performs the asymptotic control in such a manner that the torque command provided to the electric motor gets gradually close to the target regenerative torque with a passage of time, wherein when the asymptotic control condition is not satisfied, the control unit immediately provides the target regenerative torque as the torque command to the electric motor, wherein the control unit performs the asymptotic control when a difference between a value of torque output from the electric motor and a value of the target regenerative torque is larger than a predetermined value, and wherein the control unit provides the torque command equal to the target regenerative torque immediately when the difference between the value of the torque output from the electric motor and the value of the target regenerative torque is smaller than the predetermined value.