A lead component mounting method includes: a component insertion process in which two lead wires are inserted into two corresponding through-holes which are formed in a circuit board from one side of the circuit board in a state in which at least a pair of pawl portions pinches and holds each of the two lead wires which are included in a lead component; and a clinching process in which protruding portions, which are portions protruding from another side of the circuit board, of the two lead wires which are inserted into the two corresponding through-holes, are bent in a state in which the two lead wires are held by at least the pair of pawl portions.