Candidates are making their final appeals on Saturday across Japan for the Upper House election just a day after former Prime Minister Shinzo Abe was assassinated during a campaign speech.

Major political party leaders will speak directly to voters in various parts of Japan amid tighter security following Abe's death in the city of Nara in an event to rally support for his ruling coalition ahead of Sunday's election.

Abe's death has raised questions about the security measures for public figures in Japan, where politicians commonly make direct appeals to voters outside train stations and supermarkets during campaigning season.