Shock absorber

A shock absorber comprising:

• a cylinder which is filled with a working fluid;
• an outer tube which is provided on an outer circumferential side of the cylinder;
• a reservoir chamber which is formed between the outer tube and the cylinder;
• a piston which comes into sliding contact with an inner surface side of the cylinder and divides the inside of the cylinder into a one side chamber and an opposite side chamber;
• a piston rod in which the piston is fixed to one end and an opposite end extends out of the cylinder;
• a seal member which comes into sliding contact with the piston rod and prevents the working fluid from leaking out of the cylinder;
• a rod guide which is provided at a position on a side defined by the seal member of the cylinder and guides the piston rod;
• and
• a friction generating member which is provided at a position on a side defined by the seal member of the cylinder and comes into sliding contact with the piston rod,
• wherein the friction generating member has an annular elastic rubber portion which comes into sliding contact with the piston rod and a base portion to which the elastic rubber portion is fixedly attached,
• wherein the elastic rubber portion is formed such that an upstream side and a downstream side of the elastic rubber portion are able to communicate with each other when a differential pressure between the one side chamber of the cylinder and the reservoir chamber reaches a predetermined pressure,
• wherein a cross-sectional area of a communication path formed in the base portion is smaller than a cross-sectional area of a communication path between the piston rod and the rod guide, and
• wherein the upstream side and the downstream side are communicate with each other via
• the communication path between the piston rod and the rod guide, and
• the communication path formed in the base portion.