(BSS/AFP) - Japanese Prime Minister Shigeru Ishiba`s poll ratings have rebounded a month after disastrous election results left his premiership hanging by a thread, a clutch of surveys suggested Monday.

Ishiba took the helm of the long-dominant Liberal Democratic Party (LDP) last year and has since lost his majority in both houses of parliament, most recently in upper chamber elections in July.

But the self-confessed defence policy "geek" and maker of model ships has defied calls to resign from within the party, which has governed Japan almost non-stop since the 1950s.

According to one poll by the Yomiuri Shimbun daily published Monday, the approval rating for Ishiba`s cabinet was 39 percent, a remarkable 17 points higher than after the July 20 vote.

It was the biggest jump for a government since the telephone survey began in 2008, except for after prime minister changes, the Yomiuri said.

More respondents (50 percent) now think Ishiba should remain than resign (42 percent), the questionnaire showed, a reversal from July, when 54 percent said he should go and 35 percent stay.

Another poll conducted by Kyodo News put support at 35.4 percent, up 12.5 points from last month after the upper house election, while the disapproval rating stood at 49.8 percent.

A third survey by the Mainichi Shimbun put backing at 33 percent, a rise of four points, the first time it has been over 30 percent since February.

The Yomiuri put the recovery down to the recent trade deal with the United States and efforts by Ishiba`s government to curb the recent meteoric rise in the price of rice.

US President Donald Trump announced a "massive" trade deal with Japan only two days after the upper house election, cutting threatened US tariffs to 15 percent from 25 percent, while lowering those on cars to the same level.

Voter backing of Ishiba`s handling of US trade negotiations rose to 42 percent, from 29 percent in June, while the disapproval rating was 48 percent, down from 56 percent, the Yomiuri said.

An overwhelming 86 percent said they approved of the government`s decision to shift policy toward increasing rice production, with just eight percent disagreeing.

Rice prices have skyrocketed due to supply problems linked to a very hot summer in 2023 and panic-buying after a "megaquake" warning last year, amongst other factors.

Ishiba has appointed a new farm minister -- the popular Shinjiro Koizumi, 44, a potential challenger -- and his government has released emergency stocks in an effort to bring prices down.

According to media reports, the LDP plans to conduct a review of last month`s election, to be followed by a decision on whether to hold a party leadership election.

Ishiba, 68, said this month, after an LDP plenary meeting where some lawmakers reportedly urged him to step down, that he would "consider appropriately" the results of this investigation.

"I`d like to deepen my thinking as various things are going on simultaneously," he said.