Produced by Anurag Kashyap, the film, featuring Irrfan, Nawazuddin Siddiqui and Nimrat Kaur, also received appreciation during the screening at the festival.
A still from 'Lunch Box'
Even Anurag Kashyap, who was conferred with the French honour Knight of the Order of Arts and Letters, posted on Twitter: "It's begun. 'Lunch Box' wins critics week viewers choice award. It's called the Golden Rail or something. Yay."
Irrfan had earlier posted on Twitter: "The 'Lunchbox' has started spreading its wings, outstanding response."
After the movie won the critics award, the 46-year-old posted: "Just got the news the 'Lunchbox' won its first award at Cannes."