SHOCK ABSORBER

A shock absorber includes a first passage () through which a working fluid flows out from a chamber that is an upstream side to a chamber () that is a downstream side due to movement of a piston (), a first damping force generating mechanism () provided in the first passage () to generate a damping force, a second passage () provided separately from the first passage (), a second damping force generating mechanism () provided in the second passage () and opened to generate a damping force when a piston speed is lower than that of the first damping force generating mechanism (), a third passage () provided separately from the second passage (), a volume variable mechanism () provided in the third passage (), a fourth passage () provided separately from the third passage (), and a relief mechanism () provided in the fourth passage () and opened after the second damping force generating mechanism () is opened.