A damping valve comprising: a valve disc that includes a passage (3, 4), a valve seat (2d, 2c) surrounding an exit end of the passage (3, 4), and an inner peripheral seat (2f, 2h) provided inside with respect to the passage (3, 4), a ring-shaped leaf valve (Ve, Vp) stacked on the valve disc, the leaf valve (Ve, Vp) separating from and being seated on the valve seat (2d, 2c) to open and close the passage (3, 4); and a biasing mechanism (Se, Ce, Sp, Cp, 23, le, Ip, Pc, Ep, Ee, 6) configured to cause a variable biasing force to act on the leaf valve (Ve, Vp) toward the valve disc side, wherein: the entire leaf valve (Ve, Vp) is configured to axially retreat with respect to the valve disc, and a clearance is formed between the leaf valve (Ve, Vp) and the valve seat (2d, 2c) in a state in which the leaf valve (Ve, Vp) is stacked on the valve disc with no load, characterized in that the damping valve further comprises a plate (66, 62) stacked on the leaf valve (Ve, Vp) on a side opposite to the valve disc side and configured to axially retreat with respect to the valve disc together with the leaf valve (Ve, Vp), wherein the plate (66, 62) has a rigidity higher than a rigidity of the leaf valve (Ve, Vp), an outer diameter greater than an inner diameter of the valve seat (2d, 2c) and an inner diameter smaller than an outer diameter of the inner peripheral seat (2f, 2h) to reduce a deformation of the leaf valve (Ve, Vp). a valve disc that includes a passage (3, 4), a valve seat (2d, 2c) surrounding an exit end of the passage (3, 4), and an inner peripheral seat (2f, 2h) provided inside with respect to the passage (3, 4), a ring-shaped leaf valve (Ve, Vp) stacked on the valve disc, the leaf valve (Ve, Vp) separating from and being seated on the valve seat (2d, 2c) to open and close the passage (3, 4); and a biasing mechanism (Se, Ce, Sp, Cp, 23, le, Ip, Pc, Ep, Ee, 6) configured to cause a variable biasing force to act on the leaf valve (Ve, Vp) toward the valve disc side, wherein: the entire leaf valve (Ve, Vp) is configured to axially retreat with respect to the valve disc, and a clearance is formed between the leaf valve (Ve, Vp) and the valve seat (2d, 2c) in a state in which the leaf valve (Ve, Vp) is stacked on the valve disc with no load, characterized in that the damping valve further comprises a plate (66, 62) stacked on the leaf valve (Ve, Vp) on a side opposite to the valve disc side and configured to axially retreat with respect to the valve disc together with the leaf valve (Ve, Vp), wherein the plate (66, 62) has a rigidity higher than a rigidity of the leaf valve (Ve, Vp), an outer diameter greater than an inner diameter of the valve seat (2d, 2c) and an inner diameter smaller than an outer diameter of the inner peripheral seat (2f, 2h) to reduce a deformation of the leaf valve (Ve, Vp). the entire leaf valve (Ve, Vp) is configured to axially retreat with respect to the valve disc, and a clearance is formed between the leaf valve (Ve, Vp) and the valve seat (2d, 2c) in a state in which the leaf valve (Ve, Vp) is stacked on the valve disc with no load, characterized in that the damping valve further comprises a plate (66, 62) stacked on the leaf valve (Ve, Vp) on a side opposite to the valve disc side and configured to axially retreat with respect to the valve disc together with the leaf valve (Ve, Vp), wherein the plate (66, 62) has a rigidity higher than a rigidity of the leaf valve (Ve, Vp), an outer diameter greater than an inner diameter of the valve seat (2d, 2c) and an inner diameter smaller than an outer diameter of the inner peripheral seat (2f, 2h) to reduce a deformation of the leaf valve (Ve, Vp).