A conveyor tracking system comprising: a conveyance device, conveying workpieces; a robot, disposed in association with the conveyance device and picking up the workpieces conveyed by the conveyance device; an image capturing part, having an imaging visual field on a conveyance route of the conveyance device; a visual sensor, performing an image measurement on images captured by the image capturing part; a control device, generating an operation command for the robot using a parameter set that is previously calculated, based on an image measurement result obtained by the visual sensor; and a mobile device used in a process of calculating the parameter set, the mobile device having: a processor for reading and executing an operating system and a calibration application stored in a storage of the mobile device; a touch panel comprising a display, displaying one or a plurality of patterns at predetermined positions for the calibration, the displaying of the patterns being realized by the calibration application; and a position detection device for detecting a touch position touched by the robot; and a transmission part, transmitting, according to a fact of being touched in a state that the one or the plurality of the patterns is displayed, information that indicates the touch position being touched to the control device, wherein after the mobile device is disposed in the imaging visual field and is captured by the imaging capturing part, the mobile device receives a touch operation on the position detection device the touch operation performed by the robot, and the control device comprises a calculation part that calculates the parameter set based on the image analysis result obtained by the visual sensor when the mobile device is disposed in the imaging visual field in a state that the one or the plurality of the patterns are displayed, the touch position when the mobile device is touched by the robot, and a distance between a position of the mobile device when the mobile device is disposed in the imaging visual field and a position when the mobile device is touched by the robot. a conveyance device, conveying workpieces; a robot, disposed in association with the conveyance device and picking up the workpieces conveyed by the conveyance device; an image capturing part, having an imaging visual field on a conveyance route of the conveyance device; a visual sensor, performing an image measurement on images captured by the image capturing part; a control device, generating an operation command for the robot using a parameter set that is previously calculated, based on an image measurement result obtained by the visual sensor; and a mobile device used in a process of calculating the parameter set, the mobile device having: a processor for reading and executing an operating system and a calibration application stored in a storage of the mobile device; a touch panel comprising a display, displaying one or a plurality of patterns at predetermined positions for the calibration, the displaying of the patterns being realized by the calibration application; and a position detection device for detecting a touch position touched by the robot; and a transmission part, transmitting, according to a fact of being touched in a state that the one or the plurality of the patterns is displayed, information that indicates the touch position being touched to the control device, wherein after the mobile device is disposed in the imaging visual field and is captured by the imaging capturing part, the mobile device receives a touch operation on the position detection device the touch operation performed by the robot, and the control device comprises a calculation part that calculates the parameter set based on the image analysis result obtained by the visual sensor when the mobile device is disposed in the imaging visual field in a state that the one or the plurality of the patterns are displayed, the touch position when the mobile device is touched by the robot, and a distance between a position of the mobile device when the mobile device is disposed in the imaging visual field and a position when the mobile device is touched by the robot. a processor for reading and executing an operating system and a calibration application stored in a storage of the mobile device; a touch panel comprising a display, displaying one or a plurality of patterns at predetermined positions for the calibration, the displaying of the patterns being realized by the calibration application; and a position detection device for detecting a touch position touched by the robot; and a transmission part, transmitting, according to a fact of being touched in a state that the one or the plurality of the patterns is displayed, information that indicates the touch position being touched to the control device, wherein after the mobile device is disposed in the imaging visual field and is captured by the imaging capturing part, the mobile device receives a touch operation on the position detection device the touch operation performed by the robot, and the control device comprises a calculation part that calculates the parameter set based on the image analysis result obtained by the visual sensor when the mobile device is disposed in the imaging visual field in a state that the one or the plurality of the patterns are displayed, the touch position when the mobile device is touched by the robot, and a distance between a position of the mobile device when the mobile device is disposed in the imaging visual field and a position when the mobile device is touched by the robot.