Tokyo stocks tumbled Friday afternoon as a key Bank of Japan (BoJ) survey showed confidence among major manufacturers dropped to a three-year low.

The benchmark Nikkei 225 index at the Tokyo Stock Exchange lost 3.14 percent, or 526.32 points, to 16,232.35 in early afternoon trade, while the broader Topix index of all first-section shares gave up 3.01 percent, or 40.61 points, to 1,306.59.