Prosecutors had sought a 15-year sentence while Kimura’s defence team had argued for three years because he denied intending to kill Kishida, Jiji reported.
A court spokeswoman could not immediately confirm the reports.
Suspected gunpowder, as well as pipe-like objects and tools were found at Kimura’s home during a police search after the attack.
At hearings during the trial, Kimura’s lawyers said his “purpose was to gain (public) attention” so his charge should be “inflicting injury” but not attempted murder, NHK said.
Prosecutors however reportedly called the incident a “malicious terror act” and said the attacker knew his explosive was lethal.
Previous reports said Kimura once filed a lawsuit challenging the minimum age for political candidates and the requirement that they have at least ¥3 million (US$19,700) to run for national office.
Under Japanese law, candidates for upper house elections must be 30 or older, while the minimum age to run for parliament’s lower house is 25.
