An overnight tumble on Wall Street and investors' disappointment in what they see as lukewarm government action on structural reform kept Tokyo stocks weak Friday and again sent the key price index to a new postbubble closing low.

The 225-issue Nikkei stock average plunged 224.94 points, or 2.06 percent, to close at 10,713.51, its lowest finish since Oct. 12, 1984.

The broader Tokyo Stock Price Index of all first section issues was down 10.91 points, or 0.98 percent, to 1,103.67, its lowest close since March 3, 1999.