Nintendo's Wii video game console outsold rival Sony's PlayStation 3 by more than five to one in Japan in May, a research company said Tuesday.

Nintendo sold 251,794 Wii consoles last month, while Sony sold just 45,321 PS3s, according to Enterbrain, a Japanese publisher that tracks video game console sales.

The figures indicate that Nintendo is extending its lead over Sony on the Japanese electronics giant's home turf. In April the Wii outsold the PS3 by about four to one in Japan, according to the research firm.

In total, Nintendo has sold about 2.49 million Wii consoles in Japan since it was launched last December, while Sony has sold 928,642 PS3s since it was introduced here last November.