The House of Representatives adopted a resolution Tuesday to protest North Korea's rocket launch, but two of five opposition parties did not support the measure.
The Japanese Communist Party voted against the resolution proposed by the Liberal Democratic Party-New Komeito ruling bloc, and the Social Democratic Party abstained from voting.
The two minor opposition forces claimed it is not clear whether the North tested a ballistic missile Sunday or attempted to put a satellite in space, and the U.N. Security Council has not officially ruled the launch was in violation of its resolutions.