A component mounter comprising: a rotary head to which multiple nozzle holders that hold multiple suction nozzles which pick up a component are attached at predetermined intervals in a circumferential direction so as to be lowerable; a head holding unit that exchangeably holds the rotary head; a head moving device that moves the head holding unit; an R-axis driving mechanism, provided on the head holding unit, that revolves the multiple nozzle holders and the multiple suction nozzles together in a circumferential direction of the rotary head by rotating the rotary head; a lever engaging piece provided on each of the multiple nozzle holders; and a Z-axis driving mechanism that lowers and raises the suction nozzle held on the nozzle holder by lowering and raising the nozzle holder by engaging the lever engaging piece of, from among the multiple nozzle holders, the nozzle holder that is to perform component pickup and mounting operation from above and below with a pushing down member and a Z-axis lever; characterized in that the rotary head is rotated a predetermined angle each time by the R-axis driving mechanism so as to perform component pickup and mounting operations by lowering and raising the multiple nozzle holders in the order in which the nozzle holders are arranged using the Z-axis driving mechanism, the interval between the lever engaging piece of a first holder (12) which is the nozzle holder which performs component pickup and mounting operations first and the lever engaging piece of a last holder (12) which is the nozzle holder which performs component pickup and mounting operations last is set at an interval at which engagement with the Z-axis lever is released, and the interval between the lever engaging piece of the first holder (12) and the lever engaging piece of the last holder (12) is used as a passage through which the Z-axis lever passes in an up/down direction when the rotary head is attached/removed to/from the head holding unit, and except for the interval between the lever engaging piece of the first holder (12) and the lever engaging piece of the last holder (12), the intervals between the lever engaging piece of each of the nozzle holders are set at an interval at which the engagement of the lever engaging piece with the Z-axis lever and the pushing down member is not released, and during component pickup and mounting operations the lowering and raising operations of the nozzle holder by the Z-axis driving mechanism and the rotating operation of the rotary head by the R-axis driving mechanism overlap. a rotary head to which multiple nozzle holders that hold multiple suction nozzles which pick up a component are attached at predetermined intervals in a circumferential direction so as to be lowerable; a head holding unit that exchangeably holds the rotary head; a head moving device that moves the head holding unit; an R-axis driving mechanism, provided on the head holding unit, that revolves the multiple nozzle holders and the multiple suction nozzles together in a circumferential direction of the rotary head by rotating the rotary head; a lever engaging piece provided on each of the multiple nozzle holders; and a Z-axis driving mechanism that lowers and raises the suction nozzle held on the nozzle holder by lowering and raising the nozzle holder by engaging the lever engaging piece of, from among the multiple nozzle holders, the nozzle holder that is to perform component pickup and mounting operation from above and below with a pushing down member and a Z-axis lever; characterized in that the rotary head is rotated a predetermined angle each time by the R-axis driving mechanism so as to perform component pickup and mounting operations by lowering and raising the multiple nozzle holders in the order in which the nozzle holders are arranged using the Z-axis driving mechanism, the interval between the lever engaging piece of a first holder (12) which is the nozzle holder which performs component pickup and mounting operations first and the lever engaging piece of a last holder (12) which is the nozzle holder which performs component pickup and mounting operations last is set at an interval at which engagement with the Z-axis lever is released, and the interval between the lever engaging piece of the first holder (12) and the lever engaging piece of the last holder (12) is used as a passage through which the Z-axis lever passes in an up/down direction when the rotary head is attached/removed to/from the head holding unit, and except for the interval between the lever engaging piece of the first holder (12) and the lever engaging piece of the last holder (12), the intervals between the lever engaging piece of each of the nozzle holders are set at an interval at which the engagement of the lever engaging piece with the Z-axis lever and the pushing down member is not released, and during component pickup and mounting operations the lowering and raising operations of the nozzle holder by the Z-axis driving mechanism and the rotating operation of the rotary head by the R-axis driving mechanism overlap.