Abstract: It is an object of the present invention to provide a damper device which can facilitate an operation to incorporate it into a storage device including an openable/closable member. The damper device includes a cylindrical-shaped cylinder 10, a piston 20 reciprocatingly movable within the cylinder 10 in the axial direction, a piston rod 30 having one end connected to the piston 20 with the other end exposed from the cylinder 10, and a spring 40 for energizing the piston rod 30 in a direction to push it into the inside of the cylinder 10. The damper device further includes hold means which, against the energizing force of the spring 40, can hold a piston 20 connecting member at a moved position where it has been pulled out from the cylinder 10. The hold means includes, for example, a secured pawl 31 provided on the piston rod 30 and an engaging hole 55 formed in a cap 50.