A sound output device includes a main device portion that incorporates at least a battery and that is positioned behind an auricle, a sound output portion that incorporates at least a speaker and that is positioned in front of the auricle, a connection portion that connects the main device portion and the sound output portion to each other and that is positioned to run up along an ear lobe, and a joint that is removably attached to the sound output portion, that has a sound emitting opening, and that guides sound output from the speaker to an external acoustic opening, in which the joint for one of a left ear or a right ear is mounted on the sound output portion.