Additional Sessions Judge Sanjay Garg remanded Manoj, 22, in judicial custody after the Delhi Police said he was not required for further interrogation.
Co-accused Pradeep, 19, is also in judicial custody till May 9.
The police had earlier obtained five days custody of Manoj for confronting him with Pradeep to know the chain of events and for taking him to his native place in Muzzafarpur, Bihar to recover "blood-stained clothes" which he was wearing at the time of commission of crime.
The police had also taken Manoj's handwriting sample to match it with the writing on a piece of paper recovered from Pradeep. The piece of paper was given to Pradeep by Manoj with instruction to call him in two days when they left Delhi and parted ways at Chhapra.
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Both, Manoj and Pradeep, are accused of raping the minor girl on April 15 in the same building in east Delhi where the girl and the accused lived.
The girl was rescued 40 hours later on April 17 and is now recuperating at AIIMS.
While Manoj headed to his in-laws' house, Pradeep went to his maternal uncle's residence in Lakhisarai.