A control device for use in a mounting system including a mounting device with a mounting head including at least a first holder on which a first pickup member of a plurality of pickup members is installed, and a second holder on which a second pickup member of the plurality of pickup members is installed, the mounting head being configured to pick up components (P) supplied from a component supply section and mount the components (P), the control device comprising: a control section configured to acquire a first deviation amount (dX, dY) of a tip of the first pickup member from its designed tip position and a second deviation amount (dX, dY) of a tip of the second pickup member from its designed tip position, and a memory section configured to store information; wherein the control section is configured to acquire identification information of the plurality of pickup members , identification information of respective holders indicating respective deviation amounts (dX, dY), and respective deviation amounts (dX, dY) at tips of the plurality of pickup members , and to store the identification information of the plurality of pickup members , the identification information of the respective holders , and the respective deviation amounts (dX, dY) in the memory section as associated information , in which the identification information of the plurality of pickup members , the identification information of the respective holders , and the respective deviation amounts (dX, dY) are associated with one another, characterized in that the control section is configured to select, by using the associated information , a combination of pickup members within the plurality of pickup members such that a distance (Lx, Ly) between the tips of the selected combination of pickup members , being obtained based on the first deviation amount (dX, dY) and the second deviation amount (dX, dY), falls within a predetermined range. a control section configured to acquire a first deviation amount (dX, dY) of a tip of the first pickup member from its designed tip position and a second deviation amount (dX, dY) of a tip of the second pickup member from its designed tip position, and a memory section configured to store information; wherein the control section is configured to acquire identification information of the plurality of pickup members , identification information of respective holders indicating respective deviation amounts (dX, dY), and respective deviation amounts (dX, dY) at tips of the plurality of pickup members , and to store the identification information of the plurality of pickup members , the identification information of the respective holders , and the respective deviation amounts (dX, dY) in the memory section as associated information , in which the identification information of the plurality of pickup members , the identification information of the respective holders , and the respective deviation amounts (dX, dY) are associated with one another, characterized in that the control section is configured to select, by using the associated information , a combination of pickup members within the plurality of pickup members such that a distance (Lx, Ly) between the tips of the selected combination of pickup members , being obtained based on the first deviation amount (dX, dY) and the second deviation amount (dX, dY), falls within a predetermined range. <EOS>