It is a bench of supreme court having 5 or more judges to decide he important question of law or fact or to decide any constitutional interpretation.
According to Article 145(3) of the Constitution matters relating to substantial question of law pertaining to the interpretation of the constitution are to be heard by the bench.
If president of India needs an opinion related to any question of law or fact which is likely to arise or already arises. Then , constitutional bench can be setup
If a two or three judge bench doubts the correctness of judgement. and decides to refer the case to a larger bench for a reconsideration of that earlier judgement reconsideration of that earlier judgement.
Some of the Landmark Cases decided by constitutional Bench
