Kishor claimed the leaders inducted into the cabinet indicate that Prime Minister Narendra Modi, Union Home Minister Amit Shah and CM Kumar are least concerned about Bihar.
The 48-year-old, who was accompanied by party colleagues like state unit chief Manoj Bharti, paid floral tributes to a statue of Mahatma Gandhi before starting his "maun upvas".
Kishor said he would "definitely quit" politics if the NDA government fulfils its poll promise and gives Rs 2 lakh each to Rs 1.5 crore women under self-employment initiatives.