Abstract: A bone conduction device includes: a case; a vibrating body disposed in the case; and a first weight held by the vibrating body vibrating body. The vibrating body includes a support portion supported by the case and a first holding portion that holds the first weight. A center of mass of the first weight is located outside a first normal region of the vibrating body in the first holding portion.

Abstract: A communication device includes: a board having a first surface, a second surface opposite to the first surface, and a third surface different from both the first surface and the second surface; a first magnetic sheet disposed on a side of the first surface; a first coil disposed on the first magnetic sheet; a second magnetic sheet disposed on a side of the second surface; a second coil disposed on the second magnetic sheet; and a third coil disposed on the third surface. A part of the first magnetic sheet overlaps at least a part of the third coil in plan view.