Fluid transmission device

A fluid transmission device comprising:

• a pump impeller connected to an input;
• a turbine runner disposed so as to face the pump impeller;
• an output coupled to the turbine runner;
• and
• a lockup clutch device configured to execute lockup in which the input and the output are coupled and lockup release in which the coupling of the input and the output is disconnected,
• the pump impeller, the turbine runner, the output, and the lockup clutch device being provided in the input, wherein
• the input has a first engagement surface and a second engagement surface that face each other with the lockup clutch device interposed between the first engagement surface and the second engagement surface in an axial direction, and
• the lockup clutch device has a first lockup clutch that includes a first lockup piston in which a friction material is affixed to a surface that faces the first engagement surface, and a second lockup clutch that includes a second lockup piston in which a friction material is affixed to a surface that faces the second engagement surface, and executes lockup by supplying working oil between the first lockup piston and the second lockup piston so that the first lockup piston and the second lockup piston are spaced away from each other in the axial direction.