HEARING AID AND HOUSING

PROBLEM TO BE SOLVED: To provide a hearing aid that is hardly affected by a wind noise and suppresses a howling phenomenon.SOLUTION: A hearing aid (10) comprises a housing (20) having: an external ear insertion part (22) inserted to an external auditory meatus (31); a concave-convex bottom surface part (23) forming a shape along the concavity and convexity of the crux (32) and the helix part (33) of the ear (30); an external surface part (25) opposing to the concave-convex bottom surface part (23) and the external ear insertion part (22); and a side surface part (24) connecting the external surface part (25), the concave-convex bottom surface part (23) and the external ear insertion part (22). Inside the housing (20), the hearing aid (10) further comprises: a microphone (11) for receiving ambient sound; processing means (12) for processing a signal received with the microphone (11); and a receiver (13) for outputting output sound processed by the processing means (12) from the external ear insertion part (22) to the external auditory meatus (31). The microphone (11) is installed on the side surface part (24) on the helix part (33) side.