Damper device

A damper device comprising:

• a piston member, a cylinder member housing the piston member, and a seal member sealing between the piston member and the cylinder member, and forming a braking force by a movement or a relative movement of the piston member,
• wherein the piston member divides a first space and a second space in the cylinder member,
• the seal member has an annular shape surrounding the piston member, and includes a base portion located in a first space side of the cylinder member, and an extending portion extending from the base portion to a second space side of the cylinder member,
• the piston member includes
• a first holding portion facing the base portion of the seal member,
• a second holding portion facing an extending end of the extending portion of the seal member,
• a third holding portion facing a held portion formed at an inner side of the extending portion of the seal member, and
• a plurality of projections spaced apart from each other projecting, between the first holding portion and the second holding portion, from the piston member in a direction orthogonal to a moving central axis of the piston member, wherein
• the second holding portion is formed with one or more than two passing portions of the fluid, and
• the third holding portion includes a surface of the projection facing the first holding portion.