A woman casts her ballot at a polling station during Thailand's general election in Bangkok.

Thailand's poll body certified the results of last month's election on Monday, paving the way for the first session of parliament in the next few weeks ahead of the formation of a new government.

The election commission said it had endorsed the winners of all 500 seats of the lower house, which must convene within 15 days to elect a speaker, who will then call for a joint session of the bicameral legislature to vote on a prime minister.