The shop had been unable to cater to the demands of fans looking to snap up mementoes of the Brave Blossoms' 34-32 shock win over the twice champions, said Brett Gosper, chief executive of the sport's global governing body.
"We had to close #RWC2015 official merchandise store on Oxford St yesterday due to overwhelming merchandise demand from the Japanese public," Gosper tweeted on Monday.
Hosted by England, the Sept. 18-Oct. 31 World Cup is the biggest to date, and organisers expect it to generate commercial revenue of around 240 million pounds ($372.19 million).
A Japan rugby shirt retails in the shop for 70 pounds ($108.56), while at the other end of the scale a Japanese enamel badge costs five pounds ($7.75).
Japan face Scotland in Gloucester on Wednesday, before South Africa take on Samoa in Birmingham at the weekend.
(Editing by Justin Palmer)
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