A valve structure of a shock absorber, comprising: a valve disc provided within a cylinder and configured to partition a first pressure chamber and a second pressure chamber; a first communication passage provided to the valve disc and configured to allow communication between the first pressure chamber and the second pressure chamber; a second communication passage provided to the valve disc on the inside in the radial direction from the first communication passage, the second communication passage being configured to allow communication between the first pressure chamber and the second pressure chamber; a first seat part provided around the periphery of an opening edge of the first communication passage on the first pressure chamber side; a second seat part provided around the periphery of an opening edge of the second communication passage on the first pressure chamber side; an annular first plate valve configured to abut the first seat part and the second seat part; and a load application member configured to apply an initial load that pushes the first plate valve to the first seat part and the second seat part, wherein the valve disc includes an abutting part to which an inner peripheral edge of the first plate valve abuts and support parts provided between the second seat part and the abutting part, the support parts being configured to support the first plate valve, wherein the initial load is applied to the first plate valve within a range between the inside in the radial direction from the first seat part and the outside in the radial direction from the abutting part, the first seat part being positioned on the outside in the radial direction of the first communication passage, the first communication passage and the second communication passage configured to be closed by the first plate valve are formed independently of each other, the first seat part is formed so as to surround the opening edge of the first communication passage, and a portion between an opening edge of the first communication passage and an opening edge of the second communication passage of the first seat part forms a common seat part with the second seat part, and characterized in that the support parts are constituted by a plurality of ribs that extend radially inward from the second seat part. a valve disc provided within a cylinder and configured to partition a first pressure chamber and a second pressure chamber; a first communication passage provided to the valve disc and configured to allow communication between the first pressure chamber and the second pressure chamber; a second communication passage provided to the valve disc on the inside in the radial direction from the first communication passage, the second communication passage being configured to allow communication between the first pressure chamber and the second pressure chamber; a first seat part provided around the periphery of an opening edge of the first communication passage on the first pressure chamber side; a second seat part provided around the periphery of an opening edge of the second communication passage on the first pressure chamber side; an annular first plate valve configured to abut the first seat part and the second seat part; and a load application member configured to apply an initial load that pushes the first plate valve to the first seat part and the second seat part, wherein the valve disc includes an abutting part to which an inner peripheral edge of the first plate valve abuts and support parts provided between the second seat part and the abutting part, the support parts being configured to support the first plate valve, wherein the initial load is applied to the first plate valve within a range between the inside in the radial direction from the first seat part and the outside in the radial direction from the abutting part, the first seat part being positioned on the outside in the radial direction of the first communication passage, the first communication passage and the second communication passage configured to be closed by the first plate valve are formed independently of each other, the first seat part is formed so as to surround the opening edge of the first communication passage, and a portion between an opening edge of the first communication passage and an opening edge of the second communication passage of the first seat part forms a common seat part with the second seat part, and characterized in that the support parts are constituted by a plurality of ribs that extend radially inward from the second seat part.