Abstract: A pile driver includes an attachment frame fixed to a work arm of appropriate construction equipment that serves as a base machine, a vibration cylinder actuated and controlled by an electro-hydraulic hydraulic servo-valve and mounted on the attachment frame through a rubber buffer, and a counter weight and a chucking means for gripping a pile to be driven K provided on the axial ends, that is, on the cylinder base and on the forward end of the piston, the pile being held in such a manner that the drive direction coincides with the axis of the vibration cylinder.