Zbigniew Girzynski has become the fourth member of conservative opposition party Law and Justice to lose his job over allegations of filing dishonest travel expense claims.
''In view of concerns that may arise about my working trips, I would like to inform you that I have resigned from the Parliamentary Club and party of Law and Justice,'' Girzynski announced on his Facebook profile.
''I would like to apologise to everyone who is disappointed with my attiitude or elements of my conduct in this matter.''
However, in a subsequent interview, he then claimed to have not ''siphoned off' money from parliament.
Meanwhile, it has also been alleged that Girzynski was given an ultimatum by Law and Justice leader Jaroslaw Kaczynski, obliging him to resign or be dismissed.
The Polish edition of Newsweek had claimed that Girzynski flew to Paris with his mother when he had actually filed for funds that would cover the costs of petrol for a journey by car to the French capital.
Girzynski's resignation comes in the wake of the dismissal of three Law and Justice MPs in November over the so-called 'Madrid Affair.'
The three men had flown with their wives on budget airline to the Spanish capital, having earlier claimed that they were travelling by car.
The matter came to light after the wives of the MPs apparently became embroiled in an argument with flight attendants over the consumption of alcohol brought onto the plane.