An image measuring system comprises a measurement point acquire, a measurement direction calculator, a synthesized direction calculator operative to calculate a synthesized direction resulted from synthesis of movement directions before and after the measurement point, a fore/aft-running point calculator operative to calculate a forerunning point at a position spaced a certain distance backward in the synthesized direction from the measurement point and to calculate an aft-running point at a position spaced a certain distance forward in the synthesized direction from the measurement point, a way point calculator operative to calculate a plurality of way points arranged on a path smoothly connecting the aft-running point to the forerunning point, and a measurement path setter operative to set a measurement path following the synthesized directions and passing through the calculated way points and the measurement points.