For distilled water and mercury as working fluids, a drop formation was experimentally investigated at Bond number one order less than that of previously reported by others. A volume and a formative period of drop were measured for nozzles with outer diameters of 0.5 mm, 0.7 mm and 3.0 mm in altering nozzle exit pressure. To clear out a formative process of drop, high-speed video pictures were also taken to each nozzle for the distilled water. From above experiments, it was clear out that the drop volume at Bond number less thas 0.033 became almost constant without pressure dependence and was almost coincident with a critical volume estimated from a static equilibrium equation of gravitational pressure and surface tension. And it was also clear out that the reduction rate of the neck radius of the drop at near breakup was proportional to 1/(t_d-t) where t_d means the full time necessary to the drop formation and t means the elapsed time from the start of drop formation.