A simple structure that is easy to store is to be formed, and portability of the structure is to be increased.The structure includes: a headband to be mounted on a head; and a pair of speaker units detachably attached to the headband, wherein a suction portion is formed in the headband, a to-be-sucked portion to be sucked into the suction portion by a magnetic force from a magnet is formed in the speaker units, and one of the suction portion and the to-be-sucked portion is longer in shape than the other one. With this configuration, the structure is simplified and is made easier to store, and accordingly, portability of the structure can be increased.