The Constitution of India is the longest written constitution of any sovereign nation . It was drafted by Drafting Committee , chaired by Dr B R Ambedkar . The constitution was the adopted by the Constituent Assembly of India on 26th November 1949 and it came into force on 26th January 1950. It, which contains over all 450 articles, segregated in 22 parts, 12 schedules and 95 amendments. The English version consists of 117,369 words; there is an official Hindi version as well. However, besides the English version, there is also an official Hindi translation available.