To enhance flexibility in the design of a lockup device.

The lockup device of a torque converter 1 comprises a piston 5, a drive plate 6, and a damper mechanism 7. The damper mechanism 7 includes a plurality of outer coil spring sets 71, a plurality of inner coil spring sets 72, an intermediate member 73, and an output plate 74. A second elastic member is disposed at the radial inside of a first elastic member. The intermediate member 73 so supports the outer coil spring sets 71 and the inner coil spring sets 72 so as to be elastically deformable in the rotating direction so that the outer coil spring sets 71 and the inner coil spring sets 72 act in series.