A control device is provided for controlling an adjusting device of a human-powered vehicle. The adjusting device adjusts a front initial sag amount of a front suspension of the human-powered vehicle in a state in where a rider is riding the human-powered vehicle and a rear initial sag amount of a rear suspension of the human-powered vehicle in a state where the rider is riding the human-powered vehicle. The control device comprises an electronic controller configured to output a front control signal that adjusts the front initial sag amount of the front suspension of the human-powered vehicle, and output a rear control signal that adjusts the rear initial sag amount of the rear suspension of the human-powered vehicle to the adjusting device based on traveling information related to traveling of the human-powered vehicle.