Friction disc and damper device

A friction disc, comprising:

• a support plate including a first lateral surface and a second lateral surface, the first lateral surface facing a first side in an axial direction, the second lateral surface facing a second side in the axial direction;
• a first friction material attached to the first lateral surface of the support plate;
• and
• a second friction material attached to the second lateral surface of the support plate,
• wherein the support plate includes
• a first engaging protrusion protruding from the first lateral surface to the first side in the axial direction,
• a first recess disposed to overlap with the first engaging protrusion as seen in the axial direction, the first recess recessed on the second lateral surface to the first side in the axial direction,
• a second engaging protrusion protruding from the second lateral surface to the second side in the axial direction, and
• a second recess disposed to overlap with the second engaging protrusion as seen in the axial direction, the second recess recessed on the first lateral surface to the second side in the axial direction,
• the first friction material includes a first engaging recess engaged with the first engaging protrusion, and
• the second friction material includes a second engaging recess engaged with the second engaging protrusion.