people took part in the rally in Tokyo, but police put the figure at 30,000. Similar demonstrations were held across Japan.
Abe and his supporters say the bills are necessary for Japan to deal with a changed security environment in the face of a rising China and unpredictable North Korea.
Washington has welcomed the move to change what some see as a one-sided security alliance that compels the US to protect Japan if it were attacked.
But opponents say the reforms will drag Japan into distant American wars, and many legal scholars have said they are unconstitutional.
The legislation is deeply unpopular among the general public and support for Abe’s government is declining.
Among the protesters on Sunday were popular Japanese musician and composer Ryuichi Sakamoto and opposition party leaders including Katsuya Okada, head of the Democratic Party of Japan.
Relatively small street demonstrations are frequent in the capital. But on Thursday a group of Tokyo university students staged a rare hunger strike outside parliament to protest at the legislation.
They said they would continue as long as possible. On Wednesday the national bar association took part in a Tokyo protest rally with academics and citizen groups.
The controversial bills cleared the powerful lower house last month and are now being hotly debated in the upper house.
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