In order to ensure the defense of Edo (present-day Tokyo), General Tokugawa set up more than 50 checkpoints (facility for the purpose of inspection) in the main transportation routes of the country. Among them, the Hakone level is larger and is regarded as a fortress. It is said that the Hakone checkpoint was set at its present location in 1619 in the early Edo period. One of the main functions of the level is to control the "guns and guns go in and out of women's families". This control is mainly to prevent the flow of weapons into Edo, and to strictly supervise the escape of the wives, wives and relatives of the princes who were held in Edo as hostages to their respective territories. However, the Hakone checkpoint does not implement the supervision of the inflow of weapons, but strictly restricts the "female family out" as its main feature. The checkpoint that played an important role in the Edo period, which lasted for about 260 years, was finally abolished in 1868, the year following the change of power, ending its historical mission.