An electronic component mounting machine, comprising: a component supply device configured to supply a radial lead component to a supply position by feeding a carrier tape holding multiple radial lead components, each radial lead component consisting of a component main body and leads extending downward from the component main body, wherein the leads are held by the carrier tape; and a component transfer device configured to collect the radial lead component supplied to the supply position and mount the radial lead component to a predetermined mounting position; wherein the carrier tape includes multiple feed holes at intervals in the longitudinal direction; wherein the component supply device includes a locking section (54, 55) engageable with the feed holes, and comprises a tape feed section configured to feed the carrier tape by sliding the locking section (54, 55) in engagement with the feed holes; and wherein the component transfer device further comprises: a component holding section configured to hold the component main body of the radial lead component held by the carrier tape, and a position control section configured to control the position of the component holding section when holding the component main body, and wherein the position control section is configured to calculate the position of the component holding section, when a component main body is held, based on actual measurements of a length from an upper end to lower end of the component main body and a length from the lower end of the component main body to the center of the feed hole, wherein the length from the upper end to the lower end of the component main body and the length from the lower end of the component main body to the center of the feed hole extend in the plane of the carrier tape and in parallel directions, wherein the lengths (H1, H2) are inputted by an operator. a component supply device configured to supply a radial lead component to a supply position by feeding a carrier tape holding multiple radial lead components, each radial lead component consisting of a component main body and leads extending downward from the component main body, wherein the leads are held by the carrier tape; and a component transfer device configured to collect the radial lead component supplied to the supply position and mount the radial lead component to a predetermined mounting position; wherein the carrier tape includes multiple feed holes at intervals in the longitudinal direction; wherein the component supply device includes a locking section (54, 55) engageable with the feed holes, and comprises a tape feed section configured to feed the carrier tape by sliding the locking section (54, 55) in engagement with the feed holes; and wherein the component transfer device further comprises: a component holding section configured to hold the component main body of the radial lead component held by the carrier tape, and a position control section configured to control the position of the component holding section when holding the component main body, and wherein the position control section is configured to calculate the position of the component holding section, when a component main body is held, based on actual measurements of a length from an upper end to lower end of the component main body and a length from the lower end of the component main body to the center of the feed hole, wherein the length from the upper end to the lower end of the component main body and the length from the lower end of the component main body to the center of the feed hole extend in the plane of the carrier tape and in parallel directions, wherein the lengths (H1, H2) are inputted by an operator. a component holding section configured to hold the component main body of the radial lead component held by the carrier tape, and a position control section configured to control the position of the component holding section when holding the component main body, and wherein the position control section is configured to calculate the position of the component holding section, when a component main body is held, based on actual measurements of a length from an upper end to lower end of the component main body and a length from the lower end of the component main body to the center of the feed hole, wherein the length from the upper end to the lower end of the component main body and the length from the lower end of the component main body to the center of the feed hole extend in the plane of the carrier tape and in parallel directions, wherein the lengths (H1, H2) are inputted by an operator.