Traffic measuring device, and the traffic volume measurement method

A system construction, operation, suppressing the increase in cost of operation and maintenance, etc., to provide a traffic flow measuring device having improved measurement accuracy of the number of vehicles remaining in the inflow link. A flowing traffic amount measuring unit 22 measures the number of vehicles entering the link, outflow traffic volume measurement unit 23 measures the number of vehicles flowing out from the link. The residence residence number estimating unit 27, the number of vehicles that has flowed into the link measured, the number of vehicles flowing out from the link, and the correction coefficient using the correction coefficient of the corresponding time zone is registered in the correspondence table in the link to estimate the number of vehicles that are. Further, the correction coefficient update unit 25, the number of vehicles that has flowed into the link measured, using a number of vehicles flowing out from the link, and updates the correction coefficients registered in the correction factor correspondence table. .Field