Japan National Route 140

National Route 140 is a national highway of Japan connecting Kumagaya, Saitama and Fujikawa, Yamanashi in Japan, with a total length of 146.6 km.

The route includes the Karisaka Tunnel, first opened in 1998 and at 6.225 km is the fifth-longest road tunnel in Japan.Because it is the main road connecting Saitama and Yamanashi, both prefectures are developing the Nishikanto Road.