Damper device

A damper device comprising:

• a first rotary member including a first engaging portion and an annular chamber filled with a viscous fluid in an interior thereof;
• a second rotary member including a second engaging portion, the second rotary member rotatable relative to the first rotary member;
• a plurality of elastic members aligned in a circumferential direction in the interior of the annular chamber, the plurality of elastic members configured to elastically couple the first rotary member and the second rotary member in a rotational direction;
• and
• a plurality of end seat members, each of the plurality of end seat members disposed between one of the plurality of elastic members and at least one of the first engaging portion and the second engaging portion, the each of the plurality of end seat members including an end seat communicating groove penetrating therethrough in the circumferential direction,
• the first engaging portion protruding in an axial direction such that an end of one of the plurality of end seat members in the circumferential direction is engaged with the first engaging portion,
• the end seat communicating groove being provided on both corners at which an outer peripheral surface and lateral surfaces intersect in the each of the plurality of end seat members, and
• the end seat communicating groove at least partly overlapping the first engaging portion as viewed along the circumferential direction.