An axle bearing device for a railway vehicle, comprising: an inner ring fixable to an axle of the railway vehicle; an outer ring fixable to a journal box of the railway vehicle; and double row rolling elements arranged between raceway surfaces of the inner ring and raceway surfaces of the outer ring, wherein an opening portion between the inner ring and the outer ring is sealed by a labyrinth seal (Ls) comprising at least one axial labyrinth (La1, La2, La3, La4) and at least one radial labyrinth (Lb1, Lb2, Lb3, Lb4, Lb5), and wherein at least one of the at least one axial labyrinth and the at least one radial labyrinth which form the labyrinth seal is formed a) between the inner ring and an outer-ring-side sealing member mounted to the outer ring, or b) between the outer-ring-side sealing member mounted to the outer ring and an inner-ring-side sealing member mounted to the inner ring, characterized in that a branch portion having an end portion on the bearing internal side free from being communicated to the opening portion between the inner ring and the outer ring is provided on a path of the labyrinth seal wherein the branch portion is formed between a lid member (8, 9) arranged on an axial end portion side of the inner ring and a branch portion forming member, which is arranged between the inner ring and the lid member (8, 9). an inner ring fixable to an axle of the railway vehicle; an outer ring fixable to a journal box of the railway vehicle; and double row rolling elements arranged between raceway surfaces of the inner ring and raceway surfaces of the outer ring, wherein an opening portion between the inner ring and the outer ring is sealed by a labyrinth seal (Ls) comprising at least one axial labyrinth (La1, La2, La3, La4) and at least one radial labyrinth (Lb1, Lb2, Lb3, Lb4, Lb5), and wherein at least one of the at least one axial labyrinth and the at least one radial labyrinth which form the labyrinth seal is formed a) between the inner ring and an outer-ring-side sealing member mounted to the outer ring, or b) between the outer-ring-side sealing member mounted to the outer ring and an inner-ring-side sealing member mounted to the inner ring, characterized in that a branch portion having an end portion on the bearing internal side free from being communicated to the opening portion between the inner ring and the outer ring is provided on a path of the labyrinth seal wherein the branch portion is formed between a lid member (8, 9) arranged on an axial end portion side of the inner ring and a branch portion forming member, which is arranged between the inner ring and the lid member (8, 9). a) between the inner ring and an outer-ring-side sealing member mounted to the outer ring, or b) between the outer-ring-side sealing member mounted to the outer ring and an inner-ring-side sealing member mounted to the inner ring, characterized in that a branch portion having an end portion on the bearing internal side free from being communicated to the opening portion between the inner ring and the outer ring is provided on a path of the labyrinth seal wherein the branch portion is formed between a lid member (8, 9) arranged on an axial end portion side of the inner ring and a branch portion forming member, which is arranged between the inner ring and the lid member (8, 9).