In a headphone set, a speaker is enclosed in a housing. A cord is connected to the speaker at one end and running to the outside of the housing at another end through a pulling-out portion of the housing. The cord is inserted into a bushing at the pulling-out portion. An outer-shape expansion portion is fixed to the cord and located between the speaker and the bushing. The outer-shape expansion portion expands the outer shape of the cord. A concavity is provided to the bushing at one end of the bushing closer to the speaker. At least a portion of the outer-shape expansion portion is put in the concavity.