The Hall effect of BiSrCaCuO thin film is studied in the temperature range of 2–300 K. In the normal state the Hall‐effect data show a holelike carrier conduction and the Hall coefficient decreases slowly with increasing temperature. The hole density obtained at room temperature is 3×1021cm−3. Near the superconducting transition temperature (TMid=83 K), the Hall coefficient shows a rapid change and drops sharply from a positive value to a negative minimum value with decreasing temperature.The possible physical meaning of the obtained results is discussed.