The NLA conducted the impeachment vote at 10:10 am and 109 NLA members voted to support the impeachment motion of the National Anti-Corruption Commission while 82 voted in favour of Somsak.
An impeachment motion requires 132 votes of three fifths to have effect.
The NACC alleged that Somsak was unusually rich for failing to declare his house worth Bt16 million in Anthong when he was the education minister.
The vote was done in secret balloting.
The NLA meeting was closed at 11:43 am after the vote results were announced.