A shock absorber comprising: a cylinder in which a working fluid is enclosed; a piston which is slidably fitted in the cylinder; a piston rod which is connected to the piston and extends outside the cylinder; and a damping force generating apparatus which generates a damping force by controlling a flow of the working fluid caused by sliding of the piston in the cylinder, wherein the damping force generating apparatus includes: a main flow path (70, 80) through which the working fluid flows by the sliding of the piston in the cylinder; a main valve which generates the damping force by controlling the flow of the working fluid by opening and closing the main flow path (70, 80); a bypass flow path (33, 30a) which is branched from the main flow path (70, 80) or is provided on the main valve; a pilot chamber into which the working fluid flows via the bypass flow path (33, 30a) and which applies an internal pressure in a valve closing direction to the main valve by a pressure of the working fluid; and a pilot flow path to which the working fluid flows out from the pilot chamber, wherein the shock absorber is configured to have a first configuration in which a jet stream which is generated in a flow path narrowed by the main valve in the main flow path (70, 80) joins the flow of the working fluid which flows out from the pilot chamber via the pilot flow path, characterized in that the flow of the working fluid flowing out from the pilot chamber via the pilot flow path joins the jet stream in a direction opposite to a flow of the jet stream flowing through the main flow path (70, 80). a cylinder in which a working fluid is enclosed; a piston which is slidably fitted in the cylinder; a piston rod which is connected to the piston and extends outside the cylinder; and a damping force generating apparatus which generates a damping force by controlling a flow of the working fluid caused by sliding of the piston in the cylinder, wherein the damping force generating apparatus includes: a main flow path (70, 80) through which the working fluid flows by the sliding of the piston in the cylinder; a main valve which generates the damping force by controlling the flow of the working fluid by opening and closing the main flow path (70, 80); a bypass flow path (33, 30a) which is branched from the main flow path (70, 80) or is provided on the main valve; a pilot chamber into which the working fluid flows via the bypass flow path (33, 30a) and which applies an internal pressure in a valve closing direction to the main valve by a pressure of the working fluid; and a pilot flow path to which the working fluid flows out from the pilot chamber, wherein the shock absorber is configured to have a first configuration in which a jet stream which is generated in a flow path narrowed by the main valve in the main flow path (70, 80) joins the flow of the working fluid which flows out from the pilot chamber via the pilot flow path, characterized in that the flow of the working fluid flowing out from the pilot chamber via the pilot flow path joins the jet stream in a direction opposite to a flow of the jet stream flowing through the main flow path (70, 80). a main flow path (70, 80) through which the working fluid flows by the sliding of the piston in the cylinder; a main valve which generates the damping force by controlling the flow of the working fluid by opening and closing the main flow path (70, 80); a bypass flow path (33, 30a) which is branched from the main flow path (70, 80) or is provided on the main valve; a pilot chamber into which the working fluid flows via the bypass flow path (33, 30a) and which applies an internal pressure in a valve closing direction to the main valve by a pressure of the working fluid; and a pilot flow path to which the working fluid flows out from the pilot chamber, wherein the shock absorber is configured to have a first configuration in which a jet stream which is generated in a flow path narrowed by the main valve in the main flow path (70, 80) joins the flow of the working fluid which flows out from the pilot chamber via the pilot flow path, characterized in that the flow of the working fluid flowing out from the pilot chamber via the pilot flow path joins the jet stream in a direction opposite to a flow of the jet stream flowing through the main flow path (70, 80).