|Phenomenon that happened recently influences investor action to take a gamble on to a number of currency resulting rupiah exchange rate fluctuation. This research has a purpose to know influence of activity commerce of foreign currency to rupiah exchange rate fluctuation. The object of this research is Bank Indonesia. Data which used in this research is volume commerce of daily foreign currency and rupiah exchange rate to $ daily of period of June 2005 until June 2006. Its calculated by using Correlation analysis and of Regression Linear Modestly. The result of data analysis indicates that volume commerce of foreign currency as foreign currency commercial activity having an effect by significance to rupiah exchange rate fluctuation at level 0,05. This matter is caused by change of commerce volume that happened in foreign exchange of course will alter exchange rate or price. The change of transaction volume commerce of this foreign currency relates to investor speculation action fiddling around with rupiah exchange rate fluctuation. Speculation action taken is with buying up currency $ which is its value is assumed too low so that its value become go up later then selling at the time of its value go up to rupiah currency.