The controversial bill, proposed by the right-wing government of Prime Minister Shinzo Abe was approved by the Senate yesterday, a few days after it was passed in the lower house.
The Senate vote in favour was expected as the coalition government led by Abe's Liberal Democratic Party (LDP) holds a majority of seats there.
The opposition raised motions to stop the law but each move was rejected by the PLD members and their allies.
Abe has argued that the measure is necessary to plug a notoriously leaky government machine, which prevents its chief ally the United States from sharing intelligence.
But critics say the categories are so vague that almost anything could fit the definition. They worry that information that is embarrassing to governing politicians or to their patrons could easily be hidden from public view.
They point to the way that Tokyo withheld news of the severity of the nuclear disaster at Fukushima in 2011, and say a state that already operates largely behind closed doors will become even more secretive.
The bill allows for jail terms of up to 10 years for those convicted of leaking state secrets, as well as for those who acquire secrets through illegal means - for example through trespass.
Anyone found guilty of encouraging someone to leak a state secret could face up to five years in jail, a provision that has drawn howls of protest from journalists, lawyers and academics.
More than 250 film celebrities, including animation directors Hayao Miyazaki and Isao Takahata, along with journalists, researchers, lawyers and other influential figures had appealed for making every effort to block the law which they criticised for being "anti-liberty, anti-democratic and dangerous".
Abe has said the government intends to set up panels to provide checks and balances in the process of defining a secret. But opponents say nothing is written into the legislation and government-appointed panels are in any case unlikely to rule against their paymaster.
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