Japanese Prime Minister Shinzo Abe's ruling Liberal Democratic Party pushed for the vote alongside its coalition partner, Komeito, despite opposition lawmakers' efforts to stall the vote for over 15 hours.
The broadcaster cited five opposition party representatives expressing readiness to continue opposing the bill's passage, including a no-confidence motion against the cabinet and a motion to censure Abe.
NHK reported a majority of the lawmakers endorsing the bills, paving way for Abe's supporters in the ruling bloc to vote on the measures at the House of Councillors by the end of next week.
The legislation was previously approved by the lower chamber, the House of Representatives.
The new laws, abolishing Article 9 of the Japanese constitution that renounces the use of force in settling international disputes, would allow the Self-Defense Force to be sent overseas in an offensive military posture for the first time since World War II.
Abe’s government introduced the legislation to parliament in May, triggering nationwide rallies accusing him of using it as a pretext for militarily involving Japan in international armed conflicts.