Tokyo stocks ended lower Wednesday, extending their losing streak to a fourth day, weighed down by weak chip shares amid caution ahead of U.S. chip giant Nvidia Corp.'s earnings report.

The benchmark Nikkei stock index, the 225-issue Nikkei Stock Average, ended down 165.28 points, or 0.34 percent, from Tuesday to 48,537.70.

The broader Topix index, meanwhile, finished 5.52 points, or 0.17 percent, lower at 3,245.58.

On the stock market, heavyweight semiconductor-linked shares drew selling on concern over recent declines in U.S. artificial intelligence-related issues, while caution prevailed ahead of Nvidia's earnings, analysts said.

But the market drew some support as investors snapped up battered issues after the key Nikkei index fell over 3 percent the previous day, its sharpest percentage drop since April.