To provide a hydraulic transmission device having improved vibration reduction performance.

This device includes a fluid transmission means 20 capable of transmitting driving force transmitted to a front cover 10 from a drive source to an output shaft 50 via working fluid, a lock up means 30 capable of transmitting the drive force transmitted to the front cover 10 to the output shaft 50 via an engagement members 32, plurality of axial direction wall parts 42b, 43b provided rotatably as one unit with the front cover 10, and a retention member 44 provided rotatbly as one unit with the engagement member 32 and retaining a plurality of elastic bodies 41 with put between the axial direction wall parts 42b, 43b at both ends with respect to an axial direction, and is provided with a damper means 40 relatively rotatably connecting the front cover 10 and the engagement member 32 via the elastic body 41.