PROBLEM TO BE SOLVED: To readily and correctly grasp a repair state of a bone fracture part.SOLUTION: A device for monitoring a repair state of fracture measures flexure of a fixing plate 12 for fixing a bone fracture part 11 and determines the repair state of the bone fracture part 11 based on the measured value of the flexure to readily and correctly grasp the repair state of the bone fracture part 11.SELECTED DRAWING: Figure 1