Sound output device

A sound output device, comprising:

• a neck band wearable on a user neck, wherein
• the neck band includes:
• an intermediate unit that is one of curved or at least partially bent, wherein the intermediate unit includes a first end and a second end;
• a first arrangement unit at the first end of the intermediate unit;
• a second arrangement unit at the second end of the intermediate unit, wherein each of the first arrangement unit and the second arrangement unit comprises an internal structure;
• and
• an insertion hole in each of the first arrangement unit and the second arrangement unit, wherein
• the insertion hole includes a first portion and a second portion,
• the first portion extends in a specific direction, and
• the second portion is inclined with respect to the first portion;
• a cable partially led out from the neck band;
• and
• an earphone connected to the cable, wherein
• the cable is drawable from the neck band to both a first side of the insertion hole and a second side of the insertion hole, and
• a length of a portion of the cable on both the first side of the insertion hole and the second side of the insertion hole is changeable based on change of a position of an inserted portion of the cable in the insertion hole.