The court also sentenced Wanchai Sae-Liaw, one of seven other defendants facing the same charge, to one year in prison, effective immediately.
The case stemmed from a police raid on a casino on Feb 4, 2006 in Soi Charoen Suk on Ratchaprarop Road in the Pratunam area. Mr Paijit was gambling there at the time.
Mr Paijit and his wife Umpa were charged with jointly operating a gambling den since 2003. Also charged with the same offence were Mr Paijit's daughter Prapapan, Mr Wanchai, Surin Wongdama, Somchai Boonmunsaensook, Jongsak Chuerwichian and Umnart Meesrikamonkul.
In addition, Mr Paijit and Mrs Umpa were charged with conspiring to possess stolen goods; having in possession and purchasing goods on which tax had not been paid; and possessing more than 120 playing cards not approved by the Excise Department.
Mr Surin and Mr Somchai were also charged with conspiring to possess stolen goods.
According to the police, Mr Paijit and his wife had smuggled in 15 slot machines, 9,862 betting chips and 1,507 decks of cards.
All of the defendants denied the charges.
In September 2012, the Criminal Court acquitted all of the accused except Mr Wanchai on the charge of conspiracy to run a gambling operation.
According to the court's ruling, Mr Paijit's wife had transferred the ownership of the building that had been modified into a casino to Mr Wanchai prior to the arrests. The court said there were insufficient witnesses and evidence to prove that the other seven were involved in the gambling operation.
Mr Wanchai claimed he used the building as a sewing factory. However, evidence and witnesses' testimony confirmed that the man was the owner of the gambling den. Mr Wanchai then appealed for his acquittal.
The court did not rule on the other charges.
The prosecuting attorney assigned to the case had also appealed against the original judgement, insisting that Mr Paijit be punished as well.