A hearing aid ( 100 ) fits in an ear of a user and amplifies a sound and outputs the amplified sound. Specifically, the hearing aid includes: a microphone ( 110 ) as a pick-up unit which picks up the sound; a wireless communicating unit ( 130 ) which receives, from an external apparatus connected via wireless, an instruction for outputting a searching sound, the instruction for outputting a searching sound which is used for outputting a searching sound; an amplifier ( 140 ) which amplifies the outputted sound; an earphone ( 150 ) as an outputting unit which outputs the sound amplified by the amplifier ( 140 ); and an operation switching unit ( 120 ) which switches between a hearing mode and a searched mode, the hearing mode causing the amplifier ( 140 ) to amplify a hearing sound which is a sound picked up by the microphone ( 110 ) with a use of a first amplification factor, and the searched mode causing the amplifier ( 140 ) to amplify the searching sound, in response to the reception of the instruction for outputting a searching sound, with a use of a second amplification factor greater than the first amplification factor.