A component is provided for a human-powered vehicle. The component includes a component body, a strain gauge provided on the component body, a signal processing unit electrically connected to the strain gauge, a signal output that outputs a signal from the signal processing unit, and an electric power input electrically connected to the signal processing unit and supplied with electric power from a power supply provided on at least one of the human-powered vehicle and the component body. The strain gauge includes a substrate and a resistor provided on the substrate. The resistor is formed by a metal layer having a thickness of 0.01 micrometers or greater and 1 micrometer or less.