<p>A hearing aid for suppressing occurrence of acoustic feedback at the attaching time of the hearing aid is provided. The hearing aid includes: a sound collection unit 101 configured to collect a surrounding sound; a sound output unit 106 configured to output a sound; and a main body 101 having a shape that can be attached to an ear. The main body 100 includes: a hearing aid processing unit 102 configured to perform hearing aid processing for the surrounding sound collected by the sound collection unit 101; an attaching determination unit 104 configured to determine whether the main body 100 is attached to the ear based on the surrounding sound; a specific sound generation unit 103 configured to generate a predetermined signal; and a selection unit 105 configured to select one of the sound subjected to the hearing aid processing by the hearing aid processing unit 102 and the sound generated by the specific sound generation unit 103 based on a determination result of the attaching determination unit 104 and to output the selected sound to the sound output unit 106.</p>
