Palang Pratcharath treasurer Narumon Pinyosinwat has resigned from the party, which is part of the Pheu Thai-led coalition government, according to media reports.
Ms Narumon submitted her resignation to the Election Commission on Sept 28. The resignation took effect that day.
As a reason for her resignation, Ms Narumon said she had fully completed her legal assignment as the party treasurer.
Ms Narumon, 49, was a lecturer and professor at the National Institute of Development Administration business school and joined the PPRP for the 2019 general election and became a list MP.
She resigned to serve as a spokeswoman for the Prayut Chan-o-cha government, which was then leading the previous coalition government, and was appointed deputy labour minister in August 2020.