Forty more residents have been infected with COVID-19, Tokyo Gov. Yuriko Koike announced Friday.
The update brought the number of coronavirus cases in the capital to 299 as of 4 p.m.
The Tokyo Metropolitan Government is investigating whether the new patients had close contact with other people who are infected or recently traveled abroad.
Tokyo is at a "critical juncture" in terms of preventing a potential explosion of infections, Koike told the metro government's coronavirus task force.
Tokyo is asking residents to refrain from leaving home for nonessential purposes in the coming weekends.
The surge in confirmed cases over the past few days in the capital has prompted other prefectures to take preventive action as well.
On Friday, Aichi Gov. Hideaki Omura asked residents not to visit Tokyo for nonessential purposes this weekend to stem the spread of the virus. The request was made at a related meeting held by the Aichi Prefectural Government.
The governors of Tochigi, Gunma, Niigata, Nagano, Shizuoka and Tottori have also called on residents not to go to Tokyo.