A fluid damper device may include a tube-shaped case with a bottom wall, a tube part and a partitioning protruded part protruded from the tube part, a turning shaft provided with a body part which faces a first end face of the partitioning protruded part and a flange part enlarged to an outer side in the radial direction from the body part and faces a second end face of the partitioning protruded part, a valve body supported on an outer side of the body part, and fluid filled on an inner side of the case. A face of the flange part is provided with a first region structured to contact the partitioning protruded part and a second region where a distance between the second end face and the flange part is set to be wider than the first region along one direction in a circumferential direction.