It is owned and operated by West Nippon Expressway Company.

The expressway is designated with the number E26 under the Ministry of Land, Infrastructure, Transport and Tourism's "2016 Proposal for Realization of Expressway Numbering.

"[1] The route originates from its junction with the Meishin Expressway and Chūgoku Expressway and extends east shortly, then southward.

Tolls are charged at a flat rate (currently 510 yen for a regular passenger car).

The final section of the expressway (4.8 km between Yao Interchange and Matsubara Junction) was opened on 17 March 1988.