All 15 analysts in a Reuters poll had projected Bank Indonesia (BI) to keep its reference rate on hold on Thursday.
Between June and November, BI raised the benchmark rate by 175 basis points to 7.50 percent to calm markets jittery about the large current-account deficit, sliding rupiah and high inflation.
It also held steady the deposit facility rate, or FASBI, and lending facility rate at 5.75 percent and 7.50 percent, respectively.