A hearing aid adjusting apparatus 104 for adjusting a parameter of a hearing aid 101 has an input device 201 for accepting an operation input, a storage 203 for storing the parameter for every predetermined surrounding setting, a controller 202 for controlling the parameter for every surrounding setting, and a display 204 for displaying information about the parameter, and the input device 201 accepts selection of the plural surrounding settings and operates one of the selected surrounding settings, and the controller 202 collectively converts a parameter in the selected surrounding setting based on an operation accepted by the input device 201.