Suthep Thaugsuban's lawyer attended a hearing session following a petition asking the appeal court to overturn the lower court's decision.
The criminal court had rejected a petition submitted late last year to review an arrest warrant issued for Suthep.
The appeal court, however, decided not to revoke Suthep's arrest warrant, saying that the petition was redundant.
The opposition People's Democratic Reform Committee (PDRC), led by Suthep, a former deputy prime minister and Democrat Party leader, has been protesting against the government for four months and they accuse caretaker premier Yingluck of acting as a proxy for her fugitive brother, former premier Thaksin Shinawatra, who was ousted in a coup in 2006.
Last week, Suthep called an end to six weeks of a major shutdown at strategic locations across Bangkok during which PDRC protesters tried to force the caretaker government's ouster in a campaign that started on January 13.
Since November 2013, 70 attacks against protesters have resulted in over 20 deaths and 720 injuries.
Meanwhile, Thai army chief Gen Prayuth Chan-ocha told a Defence Council meeting that he was not selectively acting against the pro-government Red Shirt group over sedition charges, the Nation newspaper quoting a military source said.
The Red Shirt group was accused of seeking to separate the North and Northeast of the country to set up a new republic.
Prayuth insisted that any group that violated national security would face action.
The opposition Democrat Party, which has been calling for Yingluck's cabinet to quit, may go to court to ask if the caretaker government still had power after the house failed to meet within 30 days of the February 2 general election.
The opposition had boycotted the election and widely disrupted polling.
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