Former England cricket captain Michael Vaughan and South Africa's Herschelle Gibbs joined the Duchess of York, Sarah Ferguson, at a reception ahead of Saturday's opening.
England T20 player Sam Billings, also at the opening, called the facilities "world class".
Billings is taking part in a charity T20 match at the stadium on Saturday, alongside Vaughan and Trinidadian batting legend Brian Lara.
The stadium has been built with the help of a British charity, the Rwanda Cricket Stadium Foundation (RCSF), the Rwanda Cricket Association (RCA) and President Paul Kagame's government.
The pavilion is designed to look like the path of a bouncing cricket ball, and the rolling hills of Rwanda.
The game is growing fast in Rwanda and RCSF's director, 27-year-old Alby Shale, said the stadium could move the sport into the "fast lane".
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