A regenerative brake control system for a vehicle, comprising: an electric motor for activating a drive wheel; a braking operation member (31, 35) which is operable by a rider to mechanically brake the drive wheel; a regeneration operation lever which is provided separately from the braking operation member (31, 35) and operable by the rider to adjust regenerative torque of the electric motor; an acceleration operation member which is operable by the rider to set output torque or acceleration rate of a vehicle; a detecting device for detecting a vehicle state which is other than a state of the regeneration operation lever and includes a rotational speed of the electric motor, the operation amount of the acceleration operation member and the bank angle of the vehicle body; and a control unit which is configured to set a reference regenerative torque according to the vehicle state detected by the detecting device upon determining that the operation amount of the acceleration operation member is equal to or smaller than a predetermined value; wherein the control unit is configured to set a base regeneration amount of the electric motor as reference regenerative torque such that the reference regenerative torque is set lower as the rotational speed of the electric motor is closer to zero, when the rotational speed of the electric motor is in a rotational speed range which is equal to or less than a first value, and is set lower as the rotational speed of the electric motor increases, when the rotational speed of the electric motor is in a rotational speed range which is equal to or larger than a second value larger than the first value, and is set lower as the bank angle of the vehicle body increases; wherein the control unit is configured to increase the regeneration amount with respect to the reference regenerative torque when the regeneration operation lever is operated such that the regenerative torque is increased as the operation amount of the regeneration operation lever increases, and to apply a regenerative torque equal to the reference regenerative torque when the regeneration operation lever is not operated; and wherein the control unit is further configured to increase the regeneration amount as the change in the accelerator opening degree which occurs with time until the operation amount of the acceleration operation member reaches zero increases. an electric motor for activating a drive wheel; a braking operation member (31, 35) which is operable by a rider to mechanically brake the drive wheel; a regeneration operation lever which is provided separately from the braking operation member (31, 35) and operable by the rider to adjust regenerative torque of the electric motor; an acceleration operation member which is operable by the rider to set output torque or acceleration rate of a vehicle; a detecting device for detecting a vehicle state which is other than a state of the regeneration operation lever and includes a rotational speed of the electric motor, the operation amount of the acceleration operation member and the bank angle of the vehicle body; and a control unit which is configured to set a reference regenerative torque according to the vehicle state detected by the detecting device upon determining that the operation amount of the acceleration operation member is equal to or smaller than a predetermined value; wherein the control unit is configured to set a base regeneration amount of the electric motor as reference regenerative torque such that the reference regenerative torque is set lower as the rotational speed of the electric motor is closer to zero, when the rotational speed of the electric motor is in a rotational speed range which is equal to or less than a first value, and is set lower as the rotational speed of the electric motor increases, when the rotational speed of the electric motor is in a rotational speed range which is equal to or larger than a second value larger than the first value, and is set lower as the bank angle of the vehicle body increases; wherein the control unit is configured to increase the regeneration amount with respect to the reference regenerative torque when the regeneration operation lever is operated such that the regenerative torque is increased as the operation amount of the regeneration operation lever increases, and to apply a regenerative torque equal to the reference regenerative torque when the regeneration operation lever is not operated; and wherein the control unit is further configured to increase the regeneration amount as the change in the accelerator opening degree which occurs with time until the operation amount of the acceleration operation member reaches zero increases.