A component mounting machine, comprising: a component suction device which is moved by a head moving mechanism, including: a rotary head which is provided to be rotatable around an R axis which extends in a vertical direction; a plurality of nozzle holders which are held to be lowerable with a predetermined interval to the rotary head in a circumferential direction thereof; a plurality of suction nozzles which are respectively held downward by the plurality of nozzle holders and suck components; an R-axis driving mechanism which turns the plurality of nozzle holders in the circumferential direction of the rotary head integrally with the plurality of suction nozzles by rotating the rotary head around the R axis; and a Q-axis driving mechanism which corrects a direction of each component which is sucked by each suction nozzle held by each nozzle holder by rotating each of the plural nozzle holders around an axial line of each nozzle holder, wherein a driving unit in which the R-axis driving mechanism and the Q-axis driving mechanism are assembled is attached to the head moving mechanism, wherein the rotary head in which the plurality of nozzle holders are held is attachably and detachably linked to the driving unit, wherein, in the rotary head, a nozzle rotation gear mechanism which transfers a rotating force of the Q-axis driving mechanism to each nozzle holder is provided, and wherein, by providing a positioning projection portion in a linking member on one side of a part which links the nozzle rotation gear mechanism and the Q-axis driving mechanism, providing a nipping mechanism which nips the positioning projection portion in a linking member on the other side, and nipping the positioning projection portion by the nipping mechanism, the nipping mechanism including a reference roller of which a position is fixed, a movable roller of which an interval with the reference roller is changed, and a bias unit which biases the movable roller in a direction of the reference roller, and the positioning projection portion is nipped between the reference roller and the movable roller, the linking member of the nozzle rotation gear mechanism is linked to the linking member of the Q-axis driving mechanism in a rotating direction by eliminating looseness. a component suction device which is moved by a head moving mechanism, including: a rotary head which is provided to be rotatable around an R axis which extends in a vertical direction; a plurality of nozzle holders which are held to be lowerable with a predetermined interval to the rotary head in a circumferential direction thereof; a plurality of suction nozzles which are respectively held downward by the plurality of nozzle holders and suck components; an R-axis driving mechanism which turns the plurality of nozzle holders in the circumferential direction of the rotary head integrally with the plurality of suction nozzles by rotating the rotary head around the R axis; and a Q-axis driving mechanism which corrects a direction of each component which is sucked by each suction nozzle held by each nozzle holder by rotating each of the plural nozzle holders around an axial line of each nozzle holder, wherein a driving unit in which the R-axis driving mechanism and the Q-axis driving mechanism are assembled is attached to the head moving mechanism, wherein the rotary head in which the plurality of nozzle holders are held is attachably and detachably linked to the driving unit, wherein, in the rotary head, a nozzle rotation gear mechanism which transfers a rotating force of the Q-axis driving mechanism to each nozzle holder is provided, and wherein, by providing a positioning projection portion in a linking member on one side of a part which links the nozzle rotation gear mechanism and the Q-axis driving mechanism, providing a nipping mechanism which nips the positioning projection portion in a linking member on the other side, and nipping the positioning projection portion by the nipping mechanism, the nipping mechanism including a reference roller of which a position is fixed, a movable roller of which an interval with the reference roller is changed, and a bias unit which biases the movable roller in a direction of the reference roller, and the positioning projection portion is nipped between the reference roller and the movable roller, the linking member of the nozzle rotation gear mechanism is linked to the linking member of the Q-axis driving mechanism in a rotating direction by eliminating looseness.