A shock absorber (100; 101; 102), comprising: a cylinder; a piston; and a piston rod, wherein the piston includes: a first valve that includes: a first leaf valve whose inner edge portion and outer edge portion in a radial direction of the piston are free ends; a first valve seat portion configured to support the inner edge portion of the first leaf valve from one side in an axial direction; a second valve seat portion configured to support the outer edge portion of the first leaf valve from another side in the axial direction; and a first oil passage, the first leaf valve opening and closing the first oil passage; and a second valve that includes: a second leaf valve (21, 22) one of whose inner edge portion (21a, 22a) and outer edge portion (21b, 22b) in the radial direction is a fixed end; and a second oil passage, the second leaf valve (21, 22) opening and closing the second oil passage, wherein the first valve is configured to open and generate a damping force corresponding to a piston speed of the piston by allowing the first leaf valve to separate from one of the first valve seat portion and the second valve seat portion corresponding to a moving direction of the piston in a state where the first leaf valve is supported by the other of the valve seat portions, the second valve is configured to open and generate a damping force corresponding to the piston speed by allowing the second leaf valve (21, 22) to deflect in a case where the moving direction of the piston is a predetermined direction, and the first valve and the second valve are arranged in series, characterized in that the first leaf valve is arranged in a state deformed by a preset load and pressed against the first valve seat portion and the second valve seat portion by its own restoring force and in that the first leaf valve has linear contact with at least any one of the first valve seat portion and the second valve seat portion. a cylinder; a piston; and a piston rod, wherein the piston includes: a first valve that includes: a first leaf valve whose inner edge portion and outer edge portion in a radial direction of the piston are free ends; a first valve seat portion configured to support the inner edge portion of the first leaf valve from one side in an axial direction; a second valve seat portion configured to support the outer edge portion of the first leaf valve from another side in the axial direction; and a first oil passage, the first leaf valve opening and closing the first oil passage; and a second valve that includes: a second leaf valve (21, 22) one of whose inner edge portion (21a, 22a) and outer edge portion (21b, 22b) in the radial direction is a fixed end; and a second oil passage, the second leaf valve (21, 22) opening and closing the second oil passage, wherein a first valve that includes: a first leaf valve whose inner edge portion and outer edge portion in a radial direction of the piston are free ends; a first valve seat portion configured to support the inner edge portion of the first leaf valve from one side in an axial direction; a second valve seat portion configured to support the outer edge portion of the first leaf valve from another side in the axial direction; and a first oil passage, the first leaf valve opening and closing the first oil passage; and a second valve that includes: a second leaf valve (21, 22) one of whose inner edge portion (21a, 22a) and outer edge portion (21b, 22b) in the radial direction is a fixed end; and a second oil passage, the second leaf valve (21, 22) opening and closing the second oil passage, wherein the first valve is configured to open and generate a damping force corresponding to a piston speed of the piston by allowing the first leaf valve to separate from one of the first valve seat portion and the second valve seat portion corresponding to a moving direction of the piston in a state where the first leaf valve is supported by the other of the valve seat portions, the second valve is configured to open and generate a damping force corresponding to the piston speed by allowing the second leaf valve (21, 22) to deflect in a case where the moving direction of the piston is a predetermined direction, and the first valve and the second valve are arranged in series, characterized in that the first leaf valve is arranged in a state deformed by a preset load and pressed against the first valve seat portion and the second valve seat portion by its own restoring force and in that the first leaf valve has linear contact with at least any one of the first valve seat portion and the second valve seat portion.