This hearing aid fitting device (1) comprises a client data storage section (10) that stores a plurality of hearing ability data and hearing adjustment result data for each of hearing ability data, a close user determination section (11) to which the client data storage section (10) and a hearing ability input section (12) are connected on the input side, a clustering section (13) that is connected to the output side of the close user determination section (11), a representative characteristic determination section (14) that is connected to the output side of the clustering section (13), an initial adjustment candidate selector (15) that is connected to the input side of the representative characteristic determination section (14), and a fine tuner (16) that is connected to the output side of the representative characteristic determination section (15).
