To enable miniaturization of a lockup device of a fluid-type torque transmission device.

This lockup device 5 of a torque converter 1 has a piston 51, a first plate 61, a second plate 62, an intermediate plate 63, a plurality of first springs 64 and a plurality of second springs 65. The intermediate plate 63 is provided so as to be able to rotate with respect to the piston 51 within a specific angular range. The second springs 65 are disposed more to the outside in the radial direction than the first springs 64 so as to act in series with the first springs 64 via the intermediate plate 63, and are held by the intermediate plate 63 so as to be elastically deformable in the rotation direction. A driven plate 68 has prongs 68a that can come into contact with the ends of the second springs 65, and is fixed to an outer peripheral part of a turbine 4.