A jet apparatus, comprising: a nozzle having an injection reference position, the nozzle configured to generate a liquid jet; an impact force distribution measuring body including a measurement reference position corresponding to the injection reference position, and a plurality of impact force detectors arranged in a lattice pattern on a plane, each impact force detector configured to detect an impact force per unit area of the jet; and a control device including a threshold storage unit configured to store a threshold, an impact force distribution measuring unit configured to measure an impact force distribution based on the impact force detected by the impact force detectors when the jet collides with the impact force distribution measuring body, an evaluation value extraction unit configured to extract an evaluation value based on the impact force distribution, and an evaluation unit configured to determine whether or not the nozzle is adaptive based on comparison result of the evaluation value and the threshold; characterised in that: the evaluation value includes a peak impact force that is a maximum impact force in the impact force distribution, and a displacement that is a distance between the measurement reference position and the position of detecting the peak impact force; the threshold includes a minimum peak impact force that is a minimum value of the peak impact force, and a maximum displacement that is a maximum value of the displacement; the evaluation value extraction unit includes a peak impact force acquisition unit configured to acquire the peak impact force, and a displacement acquisition unit configured to determine the displacement; wherein the evaluation unit determines that the nozzle is adaptive when the peak impact force is equal to or greater than the minimum peak impact force, and the displacement is equal to or smaller than the maximum displacement, and otherwise the evaluation unit determines that the nozzle is defective. a nozzle having an injection reference position, the nozzle configured to generate a liquid jet; an impact force distribution measuring body including a measurement reference position corresponding to the injection reference position, and a plurality of impact force detectors arranged in a lattice pattern on a plane, each impact force detector configured to detect an impact force per unit area of the jet; and a control device including a threshold storage unit configured to store a threshold, an impact force distribution measuring unit configured to measure an impact force distribution based on the impact force detected by the impact force detectors when the jet collides with the impact force distribution measuring body, an evaluation value extraction unit configured to extract an evaluation value based on the impact force distribution, and an evaluation unit configured to determine whether or not the nozzle is adaptive based on comparison result of the evaluation value and the threshold; a threshold storage unit configured to store a threshold, an impact force distribution measuring unit configured to measure an impact force distribution based on the impact force detected by the impact force detectors when the jet collides with the impact force distribution measuring body, an evaluation value extraction unit configured to extract an evaluation value based on the impact force distribution, and an evaluation unit configured to determine whether or not the nozzle is adaptive based on comparison result of the evaluation value and the threshold; the evaluation value includes a peak impact force that is a maximum impact force in the impact force distribution, and a displacement that is a distance between the measurement reference position and the position of detecting the peak impact force; a peak impact force that is a maximum impact force in the impact force distribution, and a displacement that is a distance between the measurement reference position and the position of detecting the peak impact force; the threshold includes a minimum peak impact force that is a minimum value of the peak impact force, and a maximum displacement that is a maximum value of the displacement; a minimum peak impact force that is a minimum value of the peak impact force, and a maximum displacement that is a maximum value of the displacement; the evaluation value extraction unit includes a peak impact force acquisition unit configured to acquire the peak impact force, and a displacement acquisition unit configured to determine the displacement; a peak impact force acquisition unit configured to acquire the peak impact force, and a displacement acquisition unit configured to determine the displacement; wherein the evaluation unit determines that the nozzle is adaptive when the peak impact force is equal to or greater than the minimum peak impact force, and the displacement is equal to or smaller than the maximum displacement, and otherwise the evaluation unit determines that the nozzle is defective.