A Magnus type wind power generator (A) comprising a horizontal rotary shaft (3) for transmitting torque to a power generating mechanism (2), rotary columns (5), flow directing plane (7) installed at main shaft (3), driving motors (15) for rotatively driving the respective rotary columns (5) around the axes thereof, which the relative action between rotation of each rotary column (5) and wind produces Magnus lift, which rotates the horizontal rotary shaft (3) so as to drive the power generating mechanism (2). Firstly, air flow directing plane (7), installed to direct flow to the low pressure area so as to cause another delay and eventually increase the Magnus lift. Secondly, the crossed spiral on the surface of the cylinder (6) provided to generate more air flow in three directions upon the rotary cylinder (5) increases the Magnus force.