To provide a torque converter with a lock-up clutch, having compact construction for improving the vibration reducing effect of a driving system resulting in a wider low-vehicle-speed region of the torque converter to which the lock-up clutch is directly connected, to improve low mileage performance.

In the torque converter, an inertia mass 35 is arranged between a transmission cover 5 and a turbine blade 2 rotatably relative thereto, the transmission cover 5 and the inertia mass 35 are connected to each other via a first torque damper spring 36 and the inertia mass 35 and the turbine blade 2 are connected to each other via a second torque damper spring 37, and the first and second torque damper springs 36, 37 are arranged radially outward from a maximum swollen point 48 on the outside face of the turbine blade 2 along the peripheral direction of the turbine blade 2.