A regeneration control system in an electric vehicle comprising: an electric motor which drives a drive wheel by electric power supplied to the electric motor and generates the electric power by rotational power applied to the electric motor by the drive wheel; an electric storage device capable of storing the electric power; an acceleration operation member for inputting an acceleration command for causing the drive wheel to be accelerated; a brake operation member for activating a brake mechanism for mechanically braking the drive wheel; a regeneration operation member provided separately from the brake operation member and the acceleration operation member to input a regeneration command; and a controller configured to cause the electric power stored in the electric storage device to be supplied to the electric motor in response to the acceleration command and charges the electric storage device with the electric power generated by the electric motor, wherein the controller is configured to adjust the electric power generated by the electric motor in response to the regeneration command input by the regeneration operation member, characterized in that the acceleration operation member is an accelerator grip and the regeneration operation member is implemented as an adjustment lever, wherein, for a fine adjustment of an output torque of the electric motor, the controller is configured to decrease the output torque of the electric motor stepwisely or continuously in response to an operation amount of the adjustment lever, when the adjustment lever is operated in a state in which the acceleration command is input by the accelerator grip, such that by moving the adjustment lever toward a cut-off position, the output torque is lessened, even down to zero, while by returning the adjustment lever to the adjustment lever reference position, the output torque is restored. an electric motor which drives a drive wheel by electric power supplied to the electric motor and generates the electric power by rotational power applied to the electric motor by the drive wheel; an electric storage device capable of storing the electric power; an acceleration operation member for inputting an acceleration command for causing the drive wheel to be accelerated; a brake operation member for activating a brake mechanism for mechanically braking the drive wheel; a regeneration operation member provided separately from the brake operation member and the acceleration operation member to input a regeneration command; and a controller configured to cause the electric power stored in the electric storage device to be supplied to the electric motor in response to the acceleration command and charges the electric storage device with the electric power generated by the electric motor, wherein the controller is configured to adjust the electric power generated by the electric motor in response to the regeneration command input by the regeneration operation member, characterized in that the acceleration operation member is an accelerator grip and the regeneration operation member is implemented as an adjustment lever, wherein, for a fine adjustment of an output torque of the electric motor, the controller is configured to decrease the output torque of the electric motor stepwisely or continuously in response to an operation amount of the adjustment lever, when the adjustment lever is operated in a state in which the acceleration command is input by the accelerator grip, such that by moving the adjustment lever toward a cut-off position, the output torque is lessened, even down to zero, while by returning the adjustment lever to the adjustment lever reference position, the output torque is restored.