TOKYO - Sanae Takaichi, president of Japan's ruling Liberal Democratic Party, won the prime ministerial designation vote in the House of Representatives on Tuesday.

While the House of Councillors will also hold a vote shortly afterward, the Japanese Constitution grants priority to the result of the lower house, meaning Takaichi is effectively confirmed as Japan's new prime minister.  

Outgoing Japanese Prime Minister Shigeru Ishiba resigned with his cabinet on Tuesday, marking an end to the administration that took office just over a year ago.

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At an extraordinary cabinet meeting held shortly before 9 am local time, ministers submitted their letters of resignation, and the Ishiba cabinet formally stepped down.

Later in the afternoon, both chambers of the Diet will convene to elect Japan's next prime minister.

Sanae Takaichi, president of the ruling Liberal Democratic Party (LDP), is expected to win the vote with the backing of the Japan Innovation Party, which has formed a new coalition with the LDP following Komeito's withdrawal from an alliance.

Takaichi is also expected to hold a press conference upon assuming office to explain her policy direction and rationale behind key cabinet picks.