As on December 14th 2015

The Prime Minister, Narendra Modi, also holds a few porfolios in his charge:
Personnel, Public Grievances and Pensions
Department of Atomic Energy
Department of Space
All important policy issues and all other portfolios not allocated to any Minister

Dr Jitendra Singh is the Minister of State:
Development of North Eastern Region (Independent Charge)
Prime Minister's Office
Personnel, Public Grievances & Pensions
Department of Atomic Energy
Department of Space