This is the longest bridge in Innai Town, Usa City, Oita Pref. This triple-arched stone bridge with a length of 59 m, a height of 14.7 m and a width of 4.55 m was completed in August, 1925. It took 1 year and 4 months to complete the construction. The people of Futsukaichi Town and Mikutsu Town cooperated to put up the money needed for the construction and built a bridge that connects the two towns. The total cost of 20,000 yen in money value of the time was mostly raised as their donation, from which fact it is understandable how important this bridge was and has been for the people living in this area. Innai Town is known as “the town of stone bridges”, where 74 stone bridges cross the Era River and its tributary rivers, which altogether flow into the Yakkan River. Those stone bridges were constructed in the late Edo period through the early Showa period. This triple-arched stone bridge shows the modern taste and elegance of the time and it is the most prominent among all the bridges. It still provides the way to ensure local people’s daily life.