Measurements on the effect of the Coriolis parameter on density current injected between stratified two layers were carried out. For this purpose we used a rotating tank with the diameter of 1m, which consists of tap and salt water layers. The results showed that the Coriolis force weakens the expansion of the density current and that, in the non-Rotating system, the intrusion area increases in proportion to t ^4/5, where t is the elapse time, while in the Rotating system the proportion ratio is t ^3/4. When the Rossby number becomes small, the patch of colored water indicating the expansion of the density current breaks up into two parts under the condition that the size of the patch exceeds a baroclinic instability limit. Also, our numerical simulation method was validated by comparing with the measuerments.