This control device for a machine tool is provided with: a display unit that displays information relating to a machine tool; a display control unit that controls the display of the display unit; and a storage unit. A display setting of the display unit that corresponds to an operation of an operator or the condition of the machine tool is stored in advance in the storage unit. The display control unit acquires an operation of the operator or the condition of the machine tool, reads the display setting corresponding to the operation of the operator or the condition of the machine tool from the storage unit, and changes the display of the display unit on the basis of the display setting.