A component mounting device comprising: a head movement mechanism, and a component adsorbing device which is configured to be moved by the head movement mechanism, wherein the component adsorbing device includes: a rotating head which is provided to be concentrically rotatable around an R axis extending vertically; a plurality of nozzle holders which are held lowerable to the rotating head at predetermined intervals in a circumferential direction of the rotating head; a plurality of suction nozzles, wherein each suction nozzle is held downward below a corresponding one of the plurality of nozzle holders, and is configured to adsorb a component; an R axis driving mechanism which is configured to rotate the plurality of nozzle holders in the circumferential direction of the rotating head integrally with the plurality of suction nozzles by rotating the rotating head around the R axis; a Q axis driving mechanism which is configured to correct a direction of each component adsorbed to each suction nozzle held by each nozzle holder by rotating each of the plurality of nozzle holders around a vertical central axis line Q, of each nozzle holder; a driving unit which comprises the R axis driving mechanism and the Q axis driving mechanism, and is configured to be attached to the head movement mechanism, wherein the rotating head to which the plurality of nozzle holders are held is configured to be detachably connected to the driving unit, a nozzle rotation gear mechanism which is configured to transfer a rotating force of the Q axis driving mechanism to each nozzle holder, and is provided on the rotating head; and a reference gear phase indicating portion which is configured to indicate a gear phase which becomes a reference for the nozzle rotation gear mechanism, and is provided on the nozzle rotation gear mechanism. a head movement mechanism, and a component adsorbing device which is configured to be moved by the head movement mechanism, wherein the component adsorbing device includes: a rotating head which is provided to be concentrically rotatable around an R axis extending vertically; a plurality of nozzle holders which are held lowerable to the rotating head at predetermined intervals in a circumferential direction of the rotating head; a plurality of suction nozzles, wherein each suction nozzle is held downward below a corresponding one of the plurality of nozzle holders, and is configured to adsorb a component; an R axis driving mechanism which is configured to rotate the plurality of nozzle holders in the circumferential direction of the rotating head integrally with the plurality of suction nozzles by rotating the rotating head around the R axis; a Q axis driving mechanism which is configured to correct a direction of each component adsorbed to each suction nozzle held by each nozzle holder by rotating each of the plurality of nozzle holders around a vertical central axis line Q, of each nozzle holder; a rotating head which is provided to be concentrically rotatable around an R axis extending vertically; a plurality of nozzle holders which are held lowerable to the rotating head at predetermined intervals in a circumferential direction of the rotating head; a plurality of suction nozzles, wherein each suction nozzle is held downward below a corresponding one of the plurality of nozzle holders, and is configured to adsorb a component; an R axis driving mechanism which is configured to rotate the plurality of nozzle holders in the circumferential direction of the rotating head integrally with the plurality of suction nozzles by rotating the rotating head around the R axis; a Q axis driving mechanism which is configured to correct a direction of each component adsorbed to each suction nozzle held by each nozzle holder by rotating each of the plurality of nozzle holders around a vertical central axis line Q, of each nozzle holder; a driving unit which comprises the R axis driving mechanism and the Q axis driving mechanism, and is configured to be attached to the head movement mechanism, wherein the rotating head to which the plurality of nozzle holders are held is configured to be detachably connected to the driving unit, a nozzle rotation gear mechanism which is configured to transfer a rotating force of the Q axis driving mechanism to each nozzle holder, and is provided on the rotating head; and a reference gear phase indicating portion which is configured to indicate a gear phase which becomes a reference for the nozzle rotation gear mechanism, and is provided on the nozzle rotation gear mechanism.