A control device (30, 51) 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 supplied from a component supply section and mount the components, the control device (30, 51) comprising: a control section (31, 52) 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 (32, 53) configured to store information; wherein the control section (31, 52) 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 (32, 53) 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 (31, 52) 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 (31, 52) 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 (32, 53) configured to store information; wherein the control section (31, 52) 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 (32, 53) 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 (31, 52) 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.