This auxiliary member for a hearing aid comprises a main body case (1) having an insertion hole (3) of a hearing aid (2) on a top face, a hearing aid accommodating space (1A) provided to the portion corresponding to the insertion hole (3) inside this main body case (1), a holding member (15) that holds the hearing aid (2) accommodated in this hearing aid accommodating space (1A), a manipulation component (11) for manipulating this holding member (15), and an opening component (16) for opening a battery case (5) of the hearing aid (2) accommodated in the hearing aid accommodating space (1A).