To provide a pile driver for enabling the turn of turnable arms to positions where they do not interrupt the revolution of a revolving superstructure, even when a protruded member such as a chain driving device exists on one side of the lower part of a leader.

An anti-vibration member 18 comprises a first turnable arm 18a and a second turnable arm 18b shorter than the first turnable arm, turnably mounted on a first turning shaft 28a and a second turning shaft 28b of a bracket 27, respectively. At the turning ends of both turnable arms 18a and 18b, connection parts 18i and 18k are provided for connecting the turning ends of both turnable arms. The connection parts 18i and 18j are positioned in a range between a straight line L1 passing through a middle point M1 between the first turning shaft and the second turning shaft and a center C1 of a steel pipe pile and a straight line L2 passing through a center C2 of the first turning shaft and the center C1 of the steel pipe pile. Both turnable arms, when being in fully opened states, are located on the inner periphery side of a circle R1 which centers around a revolution center C3 of the revolving superstructure and abuts on the outer peripheral face on the leader side of the steel pipe pile.