A damper device comprising: a coil spring (31, 32) that is interposed in a circumferential direction between a first rotating body and a second rotating body, in which two ends thereof are supported to the rotating bodies (1, 2), orienting a direction along a spring central axis (Sc), which is a center of winding, toward the circumferential direction; and a spring seat (41, 42) made of resin, having a metallic core member inside, which is attached to the rotating bodies (1, 2), in a state in which the two ends of the coil spring (31, 32) are supported in the direction along the spring central axis (Sc); wherein the spring seat (41, 42) comprises a seat portion having a spring seating surface on which are seated the ends of the coil spring (31, 32) in a direction along the spring central axis (Sc), and the metallic core member comprises: a seat portion metallic core member provided along the spring seating surface in the seat portion, a metallic core exposed portion, in which the seat portion metallic core member is exposed so as to be capable of abutting the coil spring (31, 32), is provided on a portion of the spring seating surface which slides against the coil spring (31, 32), and a coated region in which the seat portion metallic core member is coated by a resin, characterized in that the metallic core exposed portion is disposed on the spring seating surface in a region that is further to an inner diameter direction of the rotating body (1, 2) than the spring central axis (Sc), and the coated region is disposed in a region that is to an outer diameter direction of the rotating body (1, 2), wherein the coated region is coated by the resin along the surface of the seat portion, and wherein the metallic core exposed portion is provided in a semicircular arc shape along the winding shape of the coil spring (31, 32). a coil spring (31, 32) that is interposed in a circumferential direction between a first rotating body and a second rotating body, in which two ends thereof are supported to the rotating bodies (1, 2), orienting a direction along a spring central axis (Sc), which is a center of winding, toward the circumferential direction; and a spring seat (41, 42) made of resin, having a metallic core member inside, which is attached to the rotating bodies (1, 2), in a state in which the two ends of the coil spring (31, 32) are supported in the direction along the spring central axis (Sc); wherein the spring seat (41, 42) comprises a seat portion having a spring seating surface on which are seated the ends of the coil spring (31, 32) in a direction along the spring central axis (Sc), and the metallic core member comprises: a seat portion metallic core member provided along the spring seating surface in the seat portion, a metallic core exposed portion, in which the seat portion metallic core member is exposed so as to be capable of abutting the coil spring (31, 32), is provided on a portion of the spring seating surface which slides against the coil spring (31, 32), and a coated region in which the seat portion metallic core member is coated by a resin, characterized in that the metallic core exposed portion is disposed on the spring seating surface in a region that is further to an inner diameter direction of the rotating body (1, 2) than the spring central axis (Sc), and the coated region is disposed in a region that is to an outer diameter direction of the rotating body (1, 2), wherein the coated region is coated by the resin along the surface of the seat portion, and wherein the metallic core exposed portion is provided in a semicircular arc shape along the winding shape of the coil spring (31, 32). a seat portion metallic core member provided along the spring seating surface in the seat portion, a metallic core exposed portion, in which the seat portion metallic core member is exposed so as to be capable of abutting the coil spring (31, 32), is provided on a portion of the spring seating surface which slides against the coil spring (31, 32), and a coated region in which the seat portion metallic core member is coated by a resin, characterized in that the metallic core exposed portion is disposed on the spring seating surface in a region that is further to an inner diameter direction of the rotating body (1, 2) than the spring central axis (Sc), and the coated region is disposed in a region that is to an outer diameter direction of the rotating body (1, 2), wherein the coated region is coated by the resin along the surface of the seat portion, and wherein the metallic core exposed portion is provided in a semicircular arc shape along the winding shape of the coil spring (31, 32).