A railroad-car bogie, comprising: two side beams separately arranged in a rail direction; two crossbeams separately arranged in a railroad tie direction and penetrating respective center portions of the side beams 10; and two secondary spring receivers on each of which a respective secondary spring supporting a car body is placed, the secondary spring receivers being on opposite sides of the bogie, outside the side beams, wherein: each of the secondary spring receivers is a box including end portions in the railroad tie direction of the crossbeams, a center portion in the rail direction of the respective side beam, an upper plate connecting upper portions of the end portions and an upper portion of the center portion, a lower plate connecting lower portions of the end portions and a lower portion of the center portion, and a side plate connecting end portions in the railroad tie direction of the upper plate and the lower plate; characterised in that: the lower plate has a lighting hole for adjusting rigidity of the secondary spring receiver; the upper plate includes a first upper plate and a second upper plate arranged in the railroad tie direction; each secondary spring receiver includes a reinforcing plate provided substantially in parallel to the side plate and connected to the first upper plate, the lower plate, and the crossbeams; a braking device is provided to the end portion in the railroad tie direction of each crossbeam; and the braking device is provided to the respective crossbeam at a position intersecting an extended surface of the reinforcing plate. two side beams separately arranged in a rail direction; two crossbeams separately arranged in a railroad tie direction and penetrating respective center portions of the side beams 10; and two secondary spring receivers on each of which a respective secondary spring supporting a car body is placed, the secondary spring receivers being on opposite sides of the bogie, outside the side beams, wherein: each of the secondary spring receivers is a box including end portions in the railroad tie direction of the crossbeams, a center portion in the rail direction of the respective side beam, an upper plate connecting upper portions of the end portions and an upper portion of the center portion, a lower plate connecting lower portions of the end portions and a lower portion of the center portion, and a side plate connecting end portions in the railroad tie direction of the upper plate and the lower plate; characterised in that: the lower plate has a lighting hole for adjusting rigidity of the secondary spring receiver; the upper plate includes a first upper plate and a second upper plate arranged in the railroad tie direction; each secondary spring receiver includes a reinforcing plate provided substantially in parallel to the side plate and connected to the first upper plate, the lower plate, and the crossbeams; a braking device is provided to the end portion in the railroad tie direction of each crossbeam; and the braking device is provided to the respective crossbeam at a position intersecting an extended surface of the reinforcing plate. each of the secondary spring receivers is a box including end portions in the railroad tie direction of the crossbeams, a center portion in the rail direction of the respective side beam, an upper plate connecting upper portions of the end portions and an upper portion of the center portion, a lower plate connecting lower portions of the end portions and a lower portion of the center portion, and a side plate connecting end portions in the railroad tie direction of the upper plate and the lower plate; characterised in that: the lower plate has a lighting hole for adjusting rigidity of the secondary spring receiver; the upper plate includes a first upper plate and a second upper plate arranged in the railroad tie direction; each secondary spring receiver includes a reinforcing plate provided substantially in parallel to the side plate and connected to the first upper plate, the lower plate, and the crossbeams; a braking device is provided to the end portion in the railroad tie direction of each crossbeam; and the braking device is provided to the respective crossbeam at a position intersecting an extended surface of the reinforcing plate. the lower plate has a lighting hole for adjusting rigidity of the secondary spring receiver; the upper plate includes a first upper plate and a second upper plate arranged in the railroad tie direction; each secondary spring receiver includes a reinforcing plate provided substantially in parallel to the side plate and connected to the first upper plate, the lower plate, and the crossbeams; a braking device is provided to the end portion in the railroad tie direction of each crossbeam; and the braking device is provided to the respective crossbeam at a position intersecting an extended surface of the reinforcing plate.