A supporter of longtime President Robert Mugabe had gone to the High Court seeking to oust the speaker, alleging there were irregularities when legislators voted for him.
A high court judge said Tuesday that the speaker's election was carried out constitutionally and that legislators had voted freely.
Mugabe has led Zimbabwe since 1980. He was forced into a power-sharing agreement that made longtime opponent Morgan Tsvangirai the prime minister.
The coalition was formed following a series of inconclusive elections that were marred by violence blamed on Mugabe supporters.
© 2010 The Associated Press
