A component mounting machine comprising: multiple component supplying devices each configured to feed out a component (P, P1, P2) to a component supply position (F, F1, F2); a head comprising multiple nozzles each configured to suction a component (P, P1, P2); a head moving device configured to move the head such that two or more of the multiple nozzles face the respective component supply positions (F, F1, F2); nozzle lifting and lowering devices configured to lift and lower the nozzles with facing the respective component supply positions (F, F1, F2); and a control device configured to control the head moving device and the nozzle lifting and lowering devices, wherein the control device positions the head such that two or more of the multiple nozzles face the respective component supply positions (F, F1, F2), in which the control device causes the head moving device to prioritize a positional correction of a nozzle with facing a smallest sized component (P, P1, P2) in the components (P, P1, P2) supplied to the component supply positions (F, F1, F2), and in this state, causes two or more of the nozzle lifting and lowering devices, facing the respective component supply positions (F, F1, F2), to suction the respective components (P, P1, P2) simultaneously, characterized by: the control device is configured to control the head moving device for prioritizing a positional correction of the nozzle facing the smallest sized component (P, P1, P2) over positional corrections of other nozzles, wherein the control device is configured to cause the head moving device to make a predetermined suction position of the nozzle with facing the smallest sized component (P, P1, P2) to coincide with a predetermined suctioned position of the smallest sized component (P, P1, P2). multiple component supplying devices each configured to feed out a component (P, P1, P2) to a component supply position (F, F1, F2); a head comprising multiple nozzles each configured to suction a component (P, P1, P2); a head moving device configured to move the head such that two or more of the multiple nozzles face the respective component supply positions (F, F1, F2); nozzle lifting and lowering devices configured to lift and lower the nozzles with facing the respective component supply positions (F, F1, F2); and a control device configured to control the head moving device and the nozzle lifting and lowering devices, wherein the control device positions the head such that two or more of the multiple nozzles face the respective component supply positions (F, F1, F2), in which the control device causes the head moving device to prioritize a positional correction of a nozzle with facing a smallest sized component (P, P1, P2) in the components (P, P1, P2) supplied to the component supply positions (F, F1, F2), and in this state, causes two or more of the nozzle lifting and lowering devices, facing the respective component supply positions (F, F1, F2), to suction the respective components (P, P1, P2) simultaneously, characterized by: the control device is configured to control the head moving device for prioritizing a positional correction of the nozzle facing the smallest sized component (P, P1, P2) over positional corrections of other nozzles, wherein the control device is configured to cause the head moving device to make a predetermined suction position of the nozzle with facing the smallest sized component (P, P1, P2) to coincide with a predetermined suctioned position of the smallest sized component (P, P1, P2).