A component sales system sells, a plurality of components that constitutes each of a plurality of mechanisms constituting a machine at an electronic store. The component sales system includes an electronic store providing device that provides the electronic store through a communication line to a customer terminal used by a customer. The electronic store providing device includes a selected component data receiving unit, a maintenance type specifying unit, a dismounted component specifying unit, a replacement component specifying unit, a sales page generating unit, and a web page transmitting unit.