Abstract: A hanger has a support column having a protrusion. The protrusion has a first and a second protrusion formed to be protruding in opposite directions with each other on a second axial line that intersects orthogonally with a first axial line, and a third protrusion formed to be protruding on a third axial line that intersects orthogonally with the first axial line and the second axial line. A link portion has an accommodation portion for engaging and accommodating the protrusion. The hanger is linked with the link portion, such that a revolution within a first prescribed angle range around the first axial line is permitted, and a folding revolution that is a revolution within a second prescribed angle range around the second axial line is permitted when the support column is located at either one of both ends of the first prescribed angle range.

Abstract: A hanger has a support column having a protrusion. The protrusion has a first and a second protrusion formed to be protruding in opposite directions with each other on a second axial line that intersects orthogonally with a first axial line, and a third protrusion formed to be protruding on a third axial line that intersects orthogonally with the first axial line and the second axial line. A link portion has an accommodation portion for engaging and accommodating the protrusion. The hanger is linked with the link portion, such that a revolution within a first prescribed angle range around the first axial line is permitted, and a folding revolution that is a revolution within a second prescribed angle range around the second axial line is permitted when the support column is located at either one of both ends of the first prescribed angle range.

Abstract: A headphone set is equipped with left- and right-ear headphone units. Each unit includes a housing body having a first plane section and a second plane section that faces the first section, the sections being almost perpendicular to a cross section of a cavum conchae of a user's ear when the housing body is fit in the cavum conchae, a speaker and a microphone aligned between the sections, the speaker being located at the first section side, the microphone being located at the second section side. A sound output section is provided at the first section, to give off sounds output by the speaker to an outer space of the housing body. A sound pick-up hole is provided at the second section, through which the outer space communicates with an inner space of the housing body created between a sound pick-up section of the microphone and the second section.