Mr Pichit was released on bail of 100,000 baht on condition that he must refrain from inciting public disorder and chaos.
His bail was secured the day after the court approved the Department of Special Investigation's (DSI) request to hold him in custody until Jan 11 pending further investigation.
Mr Pichit is one of four NSPRT leaders who face charges of trespassing on state buildings, staging an illegal assembly and damaging state property after they led protesters to lay siege to the Foreign Ministry on Nov 25.
He was arrested at a department store in Bangkok’s Sri Nakarin area on Sunday night.
Police opposed bail for Mr Pichit, saying he might flee and tamper with evidence.
The judge ruled the suspect had denied all charges against him during interrogation and the charge and penalty was minor. There were no reasonable grounds to believe he would escape.
Mr Pichit is one of the nine defendants released on bail on criminal charges in connection with the seizure of Suvarnabhumi airport by the People's Alliance for Democracy in 2008.
The DSI has asked the court to revoke his bail, citing his role in the prolonged anti-government protests. Mr Pichit’s lawyer also filed a counter-petition. The court set Feb 24 to hear requests from both sides.