A cutting plotter comprising: a medium support means which is provided with a support face for supporting a sheet-shaped medium to be worked; a first guide rail which is provided in the medium support means so as to extend in a first direction that is parallel to the support face; a second guide rail which is attached so as to be movable in the first direction along the first guide rail and is provided so as to extend in a second direction that is parallel to the support face and intersects the first direction; a carriage which is attached so as to be movable in the second direction along the second guide rail; a work tool which is attached to the carriage so as to be movable in a third direction that is perpendicular to the support face to perform a cutting work for the medium to be worked; a working control means for executing a control for moving the second guide rail in the first direction along the first guide rail, a control for moving the carriage in the second direction along the second guide rail, and a control for moving the work tool in the third direction with respect to the carriage to perform a cutting work for the medium to be worked by the work tool; and a second direction displacement detecting means (101, 103) for measuring a second guide rail displacement amount indicating a magnitude of displacement of a moving path of the carriage from a predetermined moving path with respect to the second guide rail in a direction perpendicular to the second direction when the carriage is moved in the second direction along the second guide rail; characterized in that the working control means is configured to execute a control in which a movement control of the second guide rail on the first guide rail is added so that the second guide rail displacement amount is corrected in a movement control of the carriage on the second guide rail. a medium support means which is provided with a support face for supporting a sheet-shaped medium to be worked; a first guide rail which is provided in the medium support means so as to extend in a first direction that is parallel to the support face; a second guide rail which is attached so as to be movable in the first direction along the first guide rail and is provided so as to extend in a second direction that is parallel to the support face and intersects the first direction; a carriage which is attached so as to be movable in the second direction along the second guide rail; a work tool which is attached to the carriage so as to be movable in a third direction that is perpendicular to the support face to perform a cutting work for the medium to be worked; a working control means for executing a control for moving the second guide rail in the first direction along the first guide rail, a control for moving the carriage in the second direction along the second guide rail, and a control for moving the work tool in the third direction with respect to the carriage to perform a cutting work for the medium to be worked by the work tool; and a second direction displacement detecting means (101, 103) for measuring a second guide rail displacement amount indicating a magnitude of displacement of a moving path of the carriage from a predetermined moving path with respect to the second guide rail in a direction perpendicular to the second direction when the carriage is moved in the second direction along the second guide rail; characterized in that the working control means is configured to execute a control in which a movement control of the second guide rail on the first guide rail is added so that the second guide rail displacement amount is corrected in a movement control of the carriage on the second guide rail.