This hearing aid adjustment device is connected to a hearing aid and is used to adjust the hearing aid by using reference sounds, and comprises a memory section, an output section, an input section, a controller, and a display section. The memory section stores reference sounds to which segment information has been assigned, as well as the desired volume range for the hearing aid user. The output section outputs a reference sound from the memory section to the hearing aid. The input section inputs hearing aid processed sounds with respect to reference sounds that have undergone hearing aid processing in the hearing aid. The controller calculates the volume of segment units included in a hearing aid processed sound on the basis of segment information stored in the memory section. The display section displays in segment units whether or not the volume calculated by the controller falls within the desired volume range for the hearing aid user as stored in the memory section.
