Abstract: A damper apparatus includes a first rotating body, a second rotating body, and an elastic mechanism unit including an elastic body and paired seat members. The seat member includes a first surface portion coming into contact with one of the first rotating body and the second rotating body and a second surface portion coming into contact with another of the first rotating body and the second rotating body, a first angle ?1 formed by a first tangent line at a first point of contact, the first tangent line including a first vector and a second vector, and the first vector is 11.5°??1?22.0°, and a second angle ?2 formed by a second tangent line at a second point of contact, the second tangent line including a third vector and a fourth vector, and the third vector is 11.5°??2?22.0°.