A component supply device of the disclosure includes: a loader being capable of accommodating a plurality of stick cases in a stacked state, each of the plurality of stick cases being capable of accommodating a plurality of electronic components, each of the plurality of stick cases having an opening in an end portion in a longitudinal direction; a component transporter moving one or more electronic components supplied from the plurality of stick cases to a predetermined component supply position; and a stick case detector detecting presence or absence of one or more stick cases in the loader.