Alparslan Altan, one of 17 judges on the constitutional court, was taken into custody, the private NTV television reported, without specifying what he was accused of.
Earlier, the judicial authorities said that some 2,745 judges across the country would be dismissed in the wake of the coup.
This also came in addition to the arrests of several senior military figures including 2nd army generals Adem Huduti and Avni Angun, Turkish media said.
The government said that in all almost 3,000 soldiers had been arrested in a major purge of the armed forces.