Japan have confirmed they will rival England, South Africa and Italy for the right to host the 2015 Rugby World Cup.

All four unions will travel to Dublin on May 13 to present their cases to the International Rugby Board.

South Africa, Italy and Japan are also pitching for the 2019 World Cup. A decision on the host unions for both events will be confirmed by the IRB on July 28 after a specially convened council meeting.

The £80million tournament fee demanded by the IRB has proven a major stumbling block for the unions bidding for 2015 in such tough economic conditions.

But with a Deloitte report estimating total economic benefits to the host country of £2.1billion, all four unions have received central government backing.

Japan are aiming to become the first union outside of the Six Nations or SANZAR to host the World Cup, now considered the world's third biggest sporting event.

Nobby Mashimo, Japan Rugby Football Union chairman, said: "This is a special bid as it is a bid for rugby in Asia.

"With the support of our friends from all 26 unions in the region, and the backing of the Japanese government and business community, we believe that we can deliver a Rugby World Cup that will capture the hearts and minds of people and provide the platform to take rugby to new levels in Asia."

Japan are considered outsiders for 2015, with commercial factors making those unions in a European time zone more likely to win the IRB vote.

The IRB will be looking to maximise television, sponsorship and advertising revenues because the 2011 tournament in New Zealand is not expected to generate the same income levels as Australia 2003 or France 2007.