Ichiri-zuka are milestones placed every four kilometers (ichiri) along the Go-Kaido Roads (Five Highways) starting from Nihombashi. They were created during the Tokugawa Shogunate by building up mounds of earth on both sides of the road. They allowed travelers to keep track of distance, and were used to calculate standard wages for laborers or borrowed horses.
Okunugi settlement was located between Tsurukawa-juku and Nodajiri-juku. This ichiri-zuka is along the slope toward Okunugi settlement, and is the 19th mound from Nihombashi along the old Koshu-kaido Road. Currently, a stone monument stands at the site. The station before it is the ichiri-zuka in Tsukaba.