The member of the group suspected of being behind the 2015 Paris attacks says he and his fellow accused are being poorly treated.
Salah Abdeslam and 19 other defendants are being tried in Paris over the attacks which left 130 dead.
The trial, which is expected to last nine months, began on Wednesday.
The shooting and bombing assault by Islamic State IS group extremists was the worst post-World War Two attack in France.
French media reported that Abdeslam shouted from the dock, saying he had not complained in the past because he would be "resurrected" after death.
Victor Edou, a lawyer for eight survivors from the Bataclan attack, said some of his clients were "not doing too well" after hearing Abdeslam's remarks.
The trial is being described as the biggest in France's modern history.
Of the 20 suspects on trial, six are being tried in absentia. They are facing charges of murder, complicity and terrorist conspiracy. Several of them are thought to be dead. They can be tried in absentia because they have never officially been declared dead.
Most of the accused, including Abdeslam, could be sentenced to life in jail if convicted.
Abdeslam is the only surviving member of the group suspected of carrying out the attacks. He has been in jail since he was arrested in Belgium in 2016.
The 13 other defendants appearing in court are accused of a range of crimes, including financing and planning the attacks.
Source: BBC