This stroke initial calibration operation support device is provided with: a stroke sensor (10) which is arranged on a hydraulic cylinder and measures the stroke length of said hydraulic cylinder; a rotary encoder (20) and magnetic sensor (20a) which measure the reset reference point to which to reset the measured value of the stroke length as measured by the stroke sensor (10); a stroke end detection processing unit (30a) which detects the stroke end position in the hydraulic cylinder; a calibration processing unit (30b) which calibrates the measured value of the stroke length if the reset reference point and/or the stroke end position is detected; an HMI monitor (33) which, in the case of performing an initial calibration operation of the hydraulic cylinder, displays the entire operation mechanism in which the hydraulic cylinder is mounted; and a highlight processing unit (33e) which highlights the moveable parts for driving the hydraulic cylinder that is to be calibrated and displays the drive direction.
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