The wireless headphone 10 that receives an audio signal P in the form of an optical signal including a right-channel sound signal and a left-channel sound signal and that outputs sound from an audio output portion 12 is provided with first and second light receiving portions 15 and 16 that are disposed so as to be directed in different directions and receive the audio signal P. The wireless headphone 10 compares the S/N ratios of the signals received by the first and second light receiving portions 15 and 16, and, based on the comparison result, switches an output from the audio output portion 12 between right-channel sound and left-channel sound.