Abe's murder sparked shock and outrage in Japan and worldwide, and an outpouring of condolence messages.
Foreign Minister Yoshimasa Hayashi said Tuesday that over 1,700 condolence messages had been received from 259 countries, territories and international bodies.
On Monday, US Secretary of State Antony Blinken made a previously unscheduled stop in Tokyo to pay tribute to Abe, describing him as a "man of vision."
And Taiwanese Vice President William Lai was also in Tokyo for a surprise trip, Taiwanese media said.
The visit has the potential to anger Beijing, though Hayashi said Lai was travelling in a private capacity and there was no change to Japan's policy on working non-governmental relations with Taiwan.
After Tuesday's funeral, Abe's body will be driven past some of Tokyo's political landmarks, including the prime minister's residence -- known as the Kantei -- and the country's parliament, the Diet.
Public memorials are expected to be held at a later date, with suggestions that top foreign political leaders could attend, but no details have yet been announced.
Abe was the scion of a political family and became the country's youngest post-war prime minister when he took power for the first time in 2006, aged 52.
He resigned in 2020 at the end of his second stint after suffering health problems.
His hawkish, nationalist views were divisive, particularly his desire to reform the pacifist constitution, and he weathered a series of scandals, including allegations of cronyism.
But he was lauded by others for his economic strategy, dubbed "Abenomics", and his efforts to put Japan firmly on the world stage, including by cultivating close ties with former US president Donald Trump.
