Bicycle electrical component control system

[Means] An electrical component control system according to the present invention is a system for controlling a plurality of electrical components (2) that can be installed on an electric bicycle in which human-powered driving is assisted by a motor. In the electrical component control system, an operation mode is selected from three or more operation modes based on a state of operation of the electrical components (20). An electrical component (2) operating in the selected operation mode is controlled by a control part (12).