A horizontal-axis wind turbine using airfoil blades with uniform in width and thickness, comprising a tower installed vertically from ground surface, a nacelle rotatable connected to center of a vertical axis on top of the tower, a rotating body axially bonded to the nacelle, and one or more blades connecting and forming a pitch angle on the outer periphery of the rotating body, and the blade having an airfoil shape and having uniform in width and thickness in a longitudinal direction and generating torque from lift about a tip of the blade is provided.