The first magnet 552 may be mounted in the speaker housing. The first magnet 552 may be a permanent magnet. The second magnet 553 may be placed inside the first magnet 552, i.e. within a space defined by the first magnet 552. For example, the first magnet 552 may surround the second magnet 553. The second magnet 553 may be a permanent magnet. The speaker plate 510 and the speaker yoke 507 may be disposed on at least a portion of the second magnet 553. The speaker plate 510 may be disposed on a first surface of the second magnet 553, and the speaker yoke 507 may be disposed on a second surface. The speaker plate 510 and the speaker yoke 507 may be made of metal materials (e.g., steel) and may be attached to the upper surface and the lower surface of the second magnet 553. Here, the surface of the second magnet 553 facing the diaphragm 555 may be referred to as the upper surface, and the surface of the second magnet 553 facing the first magnetic shield structure 901 may be referred to as the lower surface.

In an embodiment, the first magnetic shield structure 901 may be coupled with a portion of the frame 509. The first magnetic shield structure 901 may have a shape of a plate. The first magnet 552 and the second magnet 553 may be mounted in an inner space where the plate of the first magnetic shield structure 901 and the frame 509 are coupled to each other. The first magnetic shield structure 901 can be coupled with the frame 509. At least a portion of the first magnetic shield structure 901 may be coupled with the frame 509.