Shock absorber

A shock absorber comprising:

• a rod;
• a piston fixed to the rod;
• a damper case having a tubular shape and surrounding a part of the rod and the piston such that the rod and the piston are movable in an axial direction, in which oil is filled inside the damper case;
• a spring urging the rod and the damper case in an extension direction that is a direction in which the rod and the damper case are separated from each other;
• a first oil flow path connected to the damper case and allowing the oil to pass therethrough;
• a compression resistance unit including a resistance unit oil chamber and a receiving member, the resistance unit oil chamber being connected to the first oil flow path and allowing the oil to flow thereinto when the rod is displaced in a compression direction opposite to the extension direction, and the receiving member having one end facing the resistance unit oil chamber and an other end receiving an urging force of the spring;
• a second oil flow path separate from the first oil flow path and allowing the oil discharged from the damper case to pass therethrough;
• a reservoir tank connected to the second oil flow path and allowing the oil to flow thereinto;
• and
• a flow rate control unit provided on the second oil flow path and configured to control a flow rate of the oil flowing to the reservoir tank.