Problem to be solved: to provide a powerful cylinder device in addition to a powerful lock force.The cylinder device comprises engaging portions (24, 33) in which a piston rod (9) having a first piston (3), a second piston (5), a claw member (19, 20), and a claw member (19, 20) are fitted.When the lock is driven, the piston rod (9) is moved to the axial lock side by the first piston (3) and the distal end portion (19b, 20b) of the at least one claw member (19, 20) is fitted into the engaging portion (24, 33); The second piston 5 is energized to the lock side in the axial direction by the increasing mechanism 10.Diagram
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