Cylinder device

A cylinder device comprising:

• a first cylinder in which a working fluid is sealed;
• a first piston fitted in the first cylinder to be slidable and partitioning an inside of the first cylinder;
• a piston rod connected to the first piston;
• and
• a stopper mechanism operating when the first piston reaches a predetermined position on a first end portion side of one axial end of the first cylinder during an extension stroke or a compression stroke, wherein
• the stopper mechanism includes:
• a second cylinder provided on the first end portion side of the first cylinder and having a smaller diameter than the first cylinder;
• and
• a second piston provided to be movable according to movement of the piston rod and able to fit into the second cylinder,
• one end of the second piston on the first end portion side comes into contact with a rod flange part between a rod first outer diameter part of the piston rod and a rod second outer diameter part having a smaller diameter than the rod first outer diameter part, and
• the other end of the second piston on a side opposite to the first end portion is biased by a biasing part which biases the second piston toward the rod flange part.