A component mounting device comprising: a component mounting head including a head main body, a nozzle holding tool (52, 84) held on the head main body in a manner capable of being raised and lowered, a first raising and lowering device (54, 120) configured to raise and lower the nozzle holding tool (52, 84) with respect to the head main body, a suction nozzle, which picks up and holds a component, that is held by the nozzle holding tool (52, 84) to be raised and lowered relative to the nozzle holding tool (52, 84), and a second raising and lowering device (106, 150) that is configured to be raised and lowered together with the nozzle holding tool (52, 84) by the first raising and lowering device (54, 120), and that is configured to raise and lower the suction nozzle relative to the nozzle holding tool (52, 84), wherein the nozzle holding tool (52, 84) is moved in an advancing direction towards a board by the first raising and lowering device (54, 120), and the suction nozzle is moved in the advancing direction by the second raising and lowering device (106, 150), so as to mount the component on the board; and a control device configured to control operation of the component mounting head, wherein the second raising and lowering device (106, 150) includes a biasing member configured to bias the suction nozzle in a retracting direction with respect to the nozzle holding tool (52, 84), an engaging member provided to be raised and lowered relative to the nozzle holding tool (52, 84) and the suction nozzle and configured to be held in a position above an engaged member and engage with the engaged member provided on the suction nozzle, and an actuator configured to raise and lower the engaging member, further wherein the actuator is configured to, by moving the engaging member in the advancing direction, cause the engaging member to engage with the engaged member of the suction nozzle, and further, by moving the engaging member in the advancing direction in a state with the engaging member engaged with the engaged member, cause the suction nozzle to be advanced against the biasing force of the biasing member, and the control device is provided with an engaging position detecting section configured to cause the engaging member to move in the advancing direction by using the actuator of the second raising and lowering device (106, 150) and detect an engaging position that is a position in a vertical direction at which the engaging member engages with the engaged member. a component mounting head including a head main body, a nozzle holding tool (52, 84) held on the head main body in a manner capable of being raised and lowered, a first raising and lowering device (54, 120) configured to raise and lower the nozzle holding tool (52, 84) with respect to the head main body, a suction nozzle, which picks up and holds a component, that is held by the nozzle holding tool (52, 84) to be raised and lowered relative to the nozzle holding tool (52, 84), and a second raising and lowering device (106, 150) that is configured to be raised and lowered together with the nozzle holding tool (52, 84) by the first raising and lowering device (54, 120), and that is configured to raise and lower the suction nozzle relative to the nozzle holding tool (52, 84), wherein the nozzle holding tool (52, 84) is moved in an advancing direction towards a board by the first raising and lowering device (54, 120), and the suction nozzle is moved in the advancing direction by the second raising and lowering device (106, 150), so as to mount the component on the board; and a control device configured to control operation of the component mounting head, wherein the second raising and lowering device (106, 150) includes a biasing member configured to bias the suction nozzle in a retracting direction with respect to the nozzle holding tool (52, 84), an engaging member provided to be raised and lowered relative to the nozzle holding tool (52, 84) and the suction nozzle and configured to be held in a position above an engaged member and engage with the engaged member provided on the suction nozzle, and an actuator configured to raise and lower the engaging member, further wherein the actuator is configured to, by moving the engaging member in the advancing direction, cause the engaging member to engage with the engaged member of the suction nozzle, and further, by moving the engaging member in the advancing direction in a state with the engaging member engaged with the engaged member, cause the suction nozzle to be advanced against the biasing force of the biasing member, and the control device is provided with an engaging position detecting section configured to cause the engaging member to move in the advancing direction by using the actuator of the second raising and lowering device (106, 150) and detect an engaging position that is a position in a vertical direction at which the engaging member engages with the engaged member.