An object of the present invention is to provide a speed limit determination system of a mobility device capable of reducing the influence on pedestrians around the mobility. A noise removal unit 21 of a server 2 detects area information of an interference area from mobility, the number of pedestrians in the interference area IAR, the speed of mobility 5, and a plurality of first data sets of pedestrian's interference scores. Among them, data sets having the same number of pedestrians in the area information and interference area IAR are extracted from the data set storage unit 23, and among the extracted data sets, a data set in which the speed of mobility 5 is within a predetermined speed range Calculate the mean interference score for Then, the speed limit calculation unit 24 determines the speed limit based on the calculated average value of the interference scores. [Selected figure] Figure 2
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