To reduce aerodynamic noise radiated from pantographs, low noise pantographs whose members have aerodynamically smooth shapes have been studied and developed. However such shapes tend to receive large aerodynamic force. Especially, the lift force acting on the panhead exercises great influence upon the dynamic upward force of low noise pantographs. The authors contrived a method to suppress the lift force of panhead passively by a variable attack angle mechanism. This paper reports the theory of the mechanism and its efficiency confirmed by wind tunnel and line tests.