A component mounting system for mounting a component on a substrate, the mounting system comprising a component supplying unit configured to supply the component; a substrate holding unit configured to hold the substrate in an orientation such that a mounting face for mounting the component on the substrate is facing vertically downward; a head configured to hold the component from vertically below; and a head drive unit that, by causing vertically upward movement of the head holding the component, causes the head to approach the substrate holding unit to mount the component on the mounting face of the substrate.