A roadside portion traffic amount calculation device of the present invention includes a positional information acquisition unit that acquires positional information, a positional information distribution determination unit that refers to road information stored in a road information storage unit and based on a positional relationship between locations of users indicated by the positional information and a road, determines a passage roadside portion that is a roadside portion in which the locations of the users are distributed for each piece of the positional information, a positional information summarizing unit that counts the number of pieces of the positional information for which the passage roadside portion has been determined by the positional information distribution determination unit for each of the roadside portions and summarizes a roadside portion traffic amount that is an amount of user traffic on each of the roadside portions, and a processing result output unit that outputs the roadside portion traffic amount summarized by the positional information summarizing unit. Thus, the traffic amount of pedestrians on each roadside portion of the road can be obtained.
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