Mr. Suthep told the demonstrators gathered at the Government Complex on Chaeng Wattana Road that their mission is not over despite the occupation of the Metropolitan Police Bureau and Government House grounds.
The protesters later withdrew to their bases, mainly around Democracy Monument and Ratchadamnoen Avenue.
"We can celebrate, but please do not get carried away," he said, referring to what he called "a partial victory".
Mr Suthep, the proclaimed secretary-general of the People's Democratic Reform Committee, made it clear that the resignation of Prime Minister Yingluck Shinawatra, or the dissolution of parliament, would not be enough to end the rallies - not until the "Thaksin influence" is uprooted from the country.