Mukesh, brother of deceased accused Ram Singh, was rushed to Safdurjung hospital after he complained of chest pain during the transit from Tihar jail to Saket court complex, special public prosecutor Dayan Krishnan informed Additional Sessions Judge Yogesh Khanna.
Krishnan said he has been informed that Mukesh has been admitted.
The court which was to begin the proceedings at 2pm adjourned the matter till 3pm to wait for the hospital's report.
He further told the court that he should be allowed to meet his client in the hospital "right now" as he does not trust the police or the doctors.
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Sharma also said, as Mukesh's brother Ram Singh died in jail, so "I don't trust that Mukesh will be provided better medical facilities".
He also sought the court's direction to appoint a doctor to examine Mukesh, which was turned down by the judge who said "let us wait for sometime".
The other three accused, Akshay Singh, Pawan Gupta and Vinay Sharma were brought to the court.
All the five adult accused in the case are facing trial for allegedly gangraping and assaulting a 23-year-old girl in a moving bus here on the night of December 16, 2012. The victim later died in a Singapore hospital on December 29.
Proceedings against accused Ram Singh had abated after his death, while the case against the sixth accused, a minor, is being conducted before a juvenile justice board.