Which part of the Constitution is called the Magna Carta?

Part III of the Constitution is described as the Magna Carta of India. It contains a very long and comprehensive list of ‘justiciable’ fundamental rights. In fact, the Fundamental Rights in our constitution are more elaborate than those found in the Constitution of any other country in the world, including the USA. 

Further Reading :

• Fundamental Rights – Articles 12-35
• Indian Polity Notes