Jack device and work machine equipped with jack device

A jack device to be mounted on a machine body of a work machine, the machine body defining a storage space, the jack device being capable of lifting up the machine body and storable in the storage space, the jack device comprising:

• an arm connectable to the machine body rotatably about an arm rotation axis extending in a machine up-down direction, which is an up-down direction of the machine body;
• a cylinder that includes a tube and a rod, the tube holding the rod so as to allow the rod to be moved relatively to the tube in a cylinder expansion-contraction direction, the entire cylinder being expanded and contracted in the cylinder expansion-contraction direction by a relative movement of the rod to the tube, the tube being connected to the arm so as to allow the cylinder to rotate about a cylinder rotation axis to have an upright posture and a tilt posture;
• a float connected to a lower end part of the rod, the float having a bottom surface placeable on the ground;
• and
• a pin that connects the float to a lower end of the rod so as to allow the float to rotate about a float rotation axis extending in a direction along the cylinder rotation axis, wherein:
• the upright posture is a posture where the cylinder expansion-contraction direction is parallel to the machine up-down direction, and the tilt posture is a posture where the cylinder expansion-contraction direction is tilted from the machine up-down direction so as to allow the jack device to be stored in the storage space with a contraction of the cylinder in the cylinder expansion-contraction direction;
• and
• the pin is configured to allow the float to rotate relatively to the rod enough to allow the bottom surface of the float of the jack device in the tilt posture to lie along a facing part of the machine body that faces the storage space to thereby allow the jack device to be stored in the storage space.