From BBC News:
The Taipei District Court judges are reported to have said there was a risk he could collude with other suspects, destroy evidence and flee the island.
Mr Chen left office in May and denies any wrongdoing.
He was taken into custody in November and charged with embezzling government funds, fraud and money laundering.
Others among the 12 charged in connection with the case include Mr Chen’s wife, son and daughter-in-law.