Dressed in white shirt and black trousers, 49-year-old Raja got down from his car and entered Parliament. He then went went straight to the Lok Sabha.
The former Telecom Minister appeared cheerful but did not speak to reporters who jostled to get a quote from him.
The DMK member from Nilgiris constituency in Tamil Nadu attended the Lok Sabha briefly during Zero Hour in the afternoon and exchanged pleasantries with some members.
He was seated for a couple of minutes in the last row before making a quiet exit with some DMK members. He left Parliament premises shortly thereafter.
Raja, the main accused in the Rs 30,000 crore 2G scam, was granted bail by a Delhi court which dismissed CBI's apprehensions that he will tamper with evidence.
Another Lok Sabha member, Suresh Kalmadi was also in Tihar jail till recently in the wake of alleged irregularities in the organisation of Commonwealth Games. The Congress member from Pune was Chairman of the CWG organising committee.