An experiment of the flow around a circular cone on a flat plate was conducted using the flow visualization method. The horse shoe vortex around the circular cone which have an angle of the top corner of 14. 3 degree was observed nearby the flat plate. On the other, the arch type vorticies were consisted behind the circular cone. In a detailed observation, it was shown that the secondary fluid motion with three-dimensionality in the vertical direction consisted on the back face of the circular cone.
