Salah Abdelsam, 31, is facing multiple life sentences after admitting to being part of the cell that struck the capital city on November 13 2015.
As it opened on Wednesday, Abdeslam appeared in the defendants’ glass box along with 13 others accused.
Jean-Louis Peries, president of the judge's bench, first told the court: “Mr Abdeslam – stand up and please state your identity.”
The bearded Abdeslam, who was dressed in black, took off his mask and said: “First of all, I want to testify that there is no other deity but Allah and that Mohammad is his servant and his messenger.”
The president interrupted him and said: “Well, we’ll see about that later.”
Asked what his profession was, Abdeslam said: “I gave up any profession to become a fighter of the Islamic State.”
He has admitted to discarding a belt full of explosives rather than blowing himself up on the November 13 attack which targeted the Stade de France, the Bataclan music venue and various bars and cafes.
On Wednesday morning, Abdeslam was removed from his cell at Fleury-Merogis prison, in the southern Paris suburbs, where he is under 24-hour video surveillance.
He was then driven in an armed convoy to a specially built court in central Paris, where specialist anti-terrorist judges will adjudicate.
Special forces officers brandishing machine guns surrounded the prison before motorcycle outriders led the convoy including a white prison services van containing Abdeslam.
He appeared in the dock along with 13 other men who are alleged to have helped carry out the terror attack, while six others will be tried in absentia.
Five of them are thought to have been killed while fighting for Isis in Syria and Iraq, while a sixth is in prison in Turkey.
Beyond preparing to attack the Stade de France, where France was playing Germany in a football friendly, Abdeslam also allegedly rented cars and hideouts for the Isis cell.
Abdeslam’s childhood friend Abdelhamid Abaaoud, who was shot dead by police, was the suspected on-the-ground coordinator of the Paris slaughter.
Victims in Paris included Englishman Nick Alexander, 31, from Weeley, Essex, who died in the Bataclan music venue.
Matthieu Chirez, a lawyer for 21 Bataclan survivors from the UK and Ireland, said the trial, which is scheduled to last for nine months, would be “a search for the truth”.
For now, the trial, which will last until May at the earliest, continues.