Shashi Tharoor, minister of state for human resource, was hospitalised after he complained of chest pain early Saturday, a day after his wife Sunanda Pushkar was found dead in a hotel here.
Tharoor who was initially admitted to the ICU was later shifted to a ward at the All India Institute of Medical Science (AIIMS).
Tharoor is now stable, an AIIMS official said.
"Everything is normal. The chest pain was normal now and his condition is stable," AIIMS PRO M.C. Mishra told IANS.
Tharoor complained of chest pain late Friday night following which he was taken to AIIMS.
His wife Sunanda Pushkar, 52, was found dead under mysterious circumstances in a suite at The Leela Palace hotel in south Delhi.
There was speculation over their relationship after the two declared they were "happily married" following public airing of tweets that hinted about an extra-marital relationship and alleged involvement of a Pakistani woman.