Kushwaha was admitted to the Indira Gandhi Institute of Medical Sciences two years ago after he suffered a brain stroke. He breathed his last at 0135 hours, the sources said.
He is survived by wife, two sons and a daughter.
Kushwaha was a co-incharge of the party's Uttar Pradesh unit and became a member of the Bihar Vidhan Parishad in May, 2012.
Condoling his death, Bihar Chief Minister Nitish Kumar described Kushwaha as "a skilled political leader and a hard-working social activist" and prayed that his family members find the strength to bear the loss.
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