A railway vehicle vibration damping device, comprising: two or more front-side vibration suppression force generation sources (Af1, Af2) adapted to be interposed between a front bogie (Tf) and a vehicle body of the railway vehicle; two or more rear-side vibration suppression force generation sources (Ar1, Ar2) adapted to be interposed between a rear bogie (Tr) and the vehicle body of the railway vehicle; and a programmable controller programmed to: calculate a yaw suppression force for suppressing vibration in a yaw direction of the vehicle body; calculate a sway suppression force for suppressing vibration in a sway direction of the vehicle body; control the front-side vibration suppression force generation sources (Af1, Af2) and the rear-side vibration suppression force generation sources (Ar1, Ar2) based on the yaw suppression force and the sway suppression force; wherein the controller is further programmed to: calculate a sway high-frequency vibration suppression force for suppressing vibration having a frequency which is not less than a frequency of a centrifugal acceleration acting on the vehicle body when the railway vehicle runs in a curve section; and let at least a part of the front-side vibration suppression force generation sources (Af1, Af2) and at least a part of the rear-side vibration suppression force generation sources (Ar1, Ar2) output a resultant force of the yaw suppression force and the sway high-frequency vibration suppression force and let all the remaining front-side vibration suppression force generation sources (Af1, Af2) and all the remaining rear-side vibration suppression force generation sources (Ar1, Ar2) function as passive dampers, when the railway vehicle runs in the curve section. two or more front-side vibration suppression force generation sources (Af1, Af2) adapted to be interposed between a front bogie (Tf) and a vehicle body of the railway vehicle; two or more rear-side vibration suppression force generation sources (Ar1, Ar2) adapted to be interposed between a rear bogie (Tr) and the vehicle body of the railway vehicle; and a programmable controller programmed to: calculate a yaw suppression force for suppressing vibration in a yaw direction of the vehicle body; calculate a sway suppression force for suppressing vibration in a sway direction of the vehicle body; control the front-side vibration suppression force generation sources (Af1, Af2) and the rear-side vibration suppression force generation sources (Ar1, Ar2) based on the yaw suppression force and the sway suppression force; wherein the controller is further programmed to: calculate a sway high-frequency vibration suppression force for suppressing vibration having a frequency which is not less than a frequency of a centrifugal acceleration acting on the vehicle body when the railway vehicle runs in a curve section; and let at least a part of the front-side vibration suppression force generation sources (Af1, Af2) and at least a part of the rear-side vibration suppression force generation sources (Ar1, Ar2) output a resultant force of the yaw suppression force and the sway high-frequency vibration suppression force and let all the remaining front-side vibration suppression force generation sources (Af1, Af2) and all the remaining rear-side vibration suppression force generation sources (Ar1, Ar2) function as passive dampers, when the railway vehicle runs in the curve section. calculate a yaw suppression force for suppressing vibration in a yaw direction of the vehicle body; calculate a sway suppression force for suppressing vibration in a sway direction of the vehicle body; control the front-side vibration suppression force generation sources (Af1, Af2) and the rear-side vibration suppression force generation sources (Ar1, Ar2) based on the yaw suppression force and the sway suppression force; wherein the controller is further programmed to: calculate a sway high-frequency vibration suppression force for suppressing vibration having a frequency which is not less than a frequency of a centrifugal acceleration acting on the vehicle body when the railway vehicle runs in a curve section; and let at least a part of the front-side vibration suppression force generation sources (Af1, Af2) and at least a part of the rear-side vibration suppression force generation sources (Ar1, Ar2) output a resultant force of the yaw suppression force and the sway high-frequency vibration suppression force and let all the remaining front-side vibration suppression force generation sources (Af1, Af2) and all the remaining rear-side vibration suppression force generation sources (Ar1, Ar2) function as passive dampers, when the railway vehicle runs in the curve section. calculate a sway high-frequency vibration suppression force for suppressing vibration having a frequency which is not less than a frequency of a centrifugal acceleration acting on the vehicle body when the railway vehicle runs in a curve section; and let at least a part of the front-side vibration suppression force generation sources (Af1, Af2) and at least a part of the rear-side vibration suppression force generation sources (Ar1, Ar2) output a resultant force of the yaw suppression force and the sway high-frequency vibration suppression force and let all the remaining front-side vibration suppression force generation sources (Af1, Af2) and all the remaining rear-side vibration suppression force generation sources (Ar1, Ar2) function as passive dampers, when the railway vehicle runs in the curve section.