The Japanese government will grant pardons on the occasion of Emperor Naruhito's enthronement ceremony on October 22.
It will be the first time in 26 years that pardons have been awarded to mark an Imperial family occasion.
The Cabinet made the decision on Friday to issue pardons next week for about 550,000 petty criminals.
The pardons annul prohibitions to qualify for certain licenses.
The government says those who committed serious crimes will not be granted pardons out of consideration for the victims and their families, and that no prisoners will be freed.
It says the pardons will apply to petty criminals who have finished their prison terms and have committed no other crimes for a certain period, to promote their efforts to return to society.
Pardons nullify penalties in guilty verdicts and restore qualifications without court procedures. They require a Cabinet decision and the approval of the Emperor.