PROBLEM TO BE SOLVED: To provide an electric cylinder system capable of easily calibrating an output of a strain detector for detecting a load of an electric cylinder. SOLUTION: An electric cylinder having a rod for pressing a work and a strain detector for outputting a value corresponding to a load applied to the rod, and a calibration strain detector when the rod presses the calibration strain detector. To bring the measured load value closer to the reference load value based on the reference load value according to the output value and the measured load value according to the output value of the strain detector when the rod presses the calibration strain detector. An output unit that outputs gains and offsets, a storage unit that stores the gains and offsets output by the output unit as calibration parameters, and an output value detected by the distortion detector based on the calibration parameters stored in the storage unit. A calibration unit that calibrates the corresponding load value is provided, and the gain and offset output by the output unit satisfy a predetermined relationship. [Selection diagram] Fig. 1
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