Mr Abe was taken shots at two times while he was giving a discourse in the southern city of Nara on Friday morning.
Security authorities at the scene handled the shooter, and the 41-year-old suspect is presently in police care.
An inquiry of the supposed shooter's home uncovered what police accept are explosives, neighborhood media detailed.
Talking before Mr Abe's passing was declared, Prime Minister Fumio Kishida censured the assault, saying: "It is uncouth and malignant and it can't go on without serious consequences."
"This assault is a demonstration of ruthlessness that occurred during the races - the actual underpinning of our majority rules government - and is totally indefensible," Mr Kishida said.
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During a news meeting at Nara Medical University Hospital, specialists said Mr Abe had supported two slug wounds to his neck, around 5cm (1inch) separated, and furthermore endured harm to his heart.
Mr Abe was supposed to be cognizant and responsive in the minutes after the assault, however the 67-year-old's condition weakened.
Specialists said no imperative signs were distinguished when the previous top state leader was moved for treatment and he needed to get a blood bonding in medical clinic.
Onlookers see man with enormous weapon
Mr Abe was giving a discourse for a political competitor in Nara at a street intersection when the assault occurred.
Observers said they saw a man conveying what they portrayed as an enormous weapon and discharging two times at Mr Abe from behind. The previous state head tumbled to the ground as spectators shouted in shock and skepticism.
Mr Abe had a group of safety police with him. Yet, it seems the shooter was as yet ready to get inside a couple of meters of Mr Abe with next to no kind of checks or obstruction.
Photographs circling in the outcome of the shooting showed the suspect standing simply behind Mr Abe as he conveyed a discourse from a traffic island in Nara city.
Security officials kept the assailant, who made no endeavor to run, and held onto his weapon which was purportedly a high quality firearm.
The suspect has been recognized as Nara occupant Tetsuya Yamagami. Nearby media reports say he is accepted to be a previous individual from Japan's Maritime Self-Defense Force, Japan's likeness a naval force. He is said to have left dynamic assistance in 2005.
Authorities still can't seem to remark on the suspect's thought processes, however nearby news sources detailed that Mr Yamagami told police he was "disappointed with previous Prime Minister Abe and expected to kill him". He is likewise answered to have let officials know that he didn't hold "resentment against the previous Prime Minister's political convictions".
Police likewise found a few potential dangerous gadgets during a hunt of his home, and NHK said bomb removal professionals are getting ready to complete a controlled blast in the vicinity.
Mr Abe's discourse came as a feature of a mission for his previous party, the Liberal Democratic Party, as upper house races in Japan are because of happen not long from now.
Pastors the nation over were subsequently told to get back to Tokyo right away, as indicated by neighborhood reports.
On Japanese virtual entertainment, the hashtag "We need a majority rules system, not savagery" was moving, with numerous virtual entertainment clients communicating their shock and nausea about the occurrence.
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