Damper device

A damper device comprising:

• a first rotary member to which a power of an engine is inputted;
• a second rotary member disposed to be rotatable relative to the first rotary member;
• a plurality of elastic members configured to elastically couple the first rotary member and the second rotary member in a rotational direction;
• a seat member disposed between at least one of the first and second rotary members and one of the plurality of elastic members, the seat member movable in the rotational direction in accordance with compression and extension of the one of the plurality of elastic members;
• and
• an auxiliary compression mechanism configured to change a posture of the seat member by causing the first or second rotary member to contact the seat member so as to compress the one of the plurality of elastic members by a predetermined amount in transmitting the power between the first rotary member and the second rotary member,
• the seat member including a first engaging portion on a surface thereof configured to contact the first or second rotary member, the first engaging portion being a recess recessed in the rotational direction, and
• the first or second rotary member including a second engaging portion, the second engaging portion being a protrusion protruding in the rotational direction configured to be engaged with the recess, the protrusion configured to change the posture of the seat member when engaged with the recess.