A railway vehicle disc brake apparatus comprising: a caliper lever (3a, 3b) that supports a pad (102a, 102b), which is opposed to a disc; a fulcrum shaft (9a, 9b) that pivotally supports the caliper lever (3a, 3b) so that the pad (102a, 102b) is movable in a direction extending toward the disc and in a direction extending away from the disc; and a drive device that drives the caliper lever (3a, 3b) about the fulcrum shaft (9a, 9b), characterized in that the caliper lever (3a, 3b) includes an arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b), and the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) includes a first part (251a, 261a, 291a, 301a, 251b, 261b, 291b, 301b) and a second part (252a, 262a, 292a, 302a, 252b, 262b, 292b, 302b) that extend in a direction in which the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) extends and that intersect each other in a cross-section (P1, P2) orthogonal to a direction in which the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) extends, during use of the railway vehicle disc brake apparatus, in the cross-section (P1, P2), an angle between a vertical direction and a direction in which the first part (251a, 261a, 291a, 301a, 251b, 261b, 291b, 301b) extends is smaller than an angle between the vertical direction and a direction in which the second part (252a, 262a, 292a, 302a, 252b, 262b, 292b, 302b) extends, the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) is arranged so that an inner surface (21a, 21b) is opposed to the drive device and an outer surface (22a, 22b) is arranged to be paired with the inner surface (21a, 21b), the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) includes an effort-side arm (25a, 26a, 25b, 26b) that extends between the drive device and the fulcrum shaft (9a, 9b), and a load-side arm (29a, 30a, 29b, 30b) that extends from a side of the fulcrum shaft (9a, 9b) toward a side of the pad (102a, 102b), and in the effort-side arm (25a, 26a, 25b, 26b), the first part (251a, 261a, 251b, 261b) is located at a side of the outer surface (22a, 22b) and the second part (252a, 262a, 252b, 262b) is located at a side of the inner surface (21a, 21b). a caliper lever (3a, 3b) that supports a pad (102a, 102b), which is opposed to a disc; a fulcrum shaft (9a, 9b) that pivotally supports the caliper lever (3a, 3b) so that the pad (102a, 102b) is movable in a direction extending toward the disc and in a direction extending away from the disc; and a drive device that drives the caliper lever (3a, 3b) about the fulcrum shaft (9a, 9b), characterized in that the caliper lever (3a, 3b) includes an arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b), and the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) includes a first part (251a, 261a, 291a, 301a, 251b, 261b, 291b, 301b) and a second part (252a, 262a, 292a, 302a, 252b, 262b, 292b, 302b) that extend in a direction in which the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) extends and that intersect each other in a cross-section (P1, P2) orthogonal to a direction in which the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) extends, during use of the railway vehicle disc brake apparatus, in the cross-section (P1, P2), an angle between a vertical direction and a direction in which the first part (251a, 261a, 291a, 301a, 251b, 261b, 291b, 301b) extends is smaller than an angle between the vertical direction and a direction in which the second part (252a, 262a, 292a, 302a, 252b, 262b, 292b, 302b) extends, the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) is arranged so that an inner surface (21a, 21b) is opposed to the drive device and an outer surface (22a, 22b) is arranged to be paired with the inner surface (21a, 21b), the arm (25a, 26a, 25b, 26b, 29a, 30a, 29b, 30b) includes an effort-side arm (25a, 26a, 25b, 26b) that extends between the drive device and the fulcrum shaft (9a, 9b), and a load-side arm (29a, 30a, 29b, 30b) that extends from a side of the fulcrum shaft (9a, 9b) toward a side of the pad (102a, 102b), and in the effort-side arm (25a, 26a, 25b, 26b), the first part (251a, 261a, 251b, 261b) is located at a side of the outer surface (22a, 22b) and the second part (252a, 262a, 252b, 262b) is located at a side of the inner surface (21a, 21b).