Whether part-time or professional, Japan's stock investors are heading for the exits.

Sell orders from large foreign pension funds contributed to Monday's slump, according to Credit Suisse Group AG, as the value of the first section of the Tokyo Stock Exchange, home to the country's biggest companies, tumbled the most since the 1987 crash. Individual investors who suffered some of the worst losses on small-cap shares seen in the past decade were staying up to watch New York for cues on what to do Tuesday, said Yoshihiro Ito, chief strategist at Okasan Online Securities Co.

Tokyo stocks tumbled further Tuesday after swinging wildly, with the Nikkei 225 average closing at 17,806.70, a fall of 733.98 points.