The invention relates to a flexible adaptive hearing aid characterized by comprising: a part made of rigid material (1) which will contain the electronic circuit of the hearing aid, and a part made of flexible adaptive material (2) which will have at least one annular flange (3) which will improve the fit between the assembly and the internal auditory canal of the user. The part made of flexible material will cover at least a portion (4) of the surface of the part of rigid material. It will additionally have a cover to assure assembly tightness.