Abstract: The present invention relates to a necklace-type audio output apparatus that can be adjusted in length, wherein the device comprises: an audio output device for externally outputting audio; a body on which the audio output device is installed; and an adjusting member connected to both ends of the body to form a ring shape together with the body, and capable of length adjustment. According to the present invention, by being worn around the neck of a user, the apparatus does not have to be worn directly on the ears. Thus, wearing discomfort and difficulty communicating due to blocked ambient noise are alleviated, length adjustment according to a user's physique or taste is made easy, and the apparatus can be safely and conveniently worn during exercise, hiking, cycling, and jogging.