The Diet approved a 20 percent cut in legislators' summer bonuses Friday after the House of Councilors unanimously voted for a bill to amend a law regulating Diet members' expenses and allowances.

Lawmakers, except the top and deputy posts in the two Diet chambers, will receive about ¥2.4 million this summer, down from approximately ¥3 million last year.

Bonuses for the top two posts of the chambers will be reduced to about ¥4 million from about ¥5 million, while those for the deputy posts will be cut to about ¥3 million from ¥3.7 million.

The move follows the government's decision to cut bonuses for civil servants this summer, which would also lower the bonuses of Diet members by about 10 percent.

The Liberal Democratic Party-New Komeito ruling coalition proposed doubling the reduction for lawmakers to 20 percent, and the opposition bloc agreed.