A hearing assistance suitability determining device, that determines suitability including whether a subject can clearly hear speech using dichotic hearing assistance, includes: a subject hearing ability information input unit; a hearing ability type determining unit that determines at least one hearing ability type that corresponds to the hearing ability information, based on hearing ability information frequency characteristics; a suitability determining unit that determines suitability for dichotic hearing assistance based on the at least one hearing ability type determined by the hearing ability type determining unit; and suitability presenting unit that presents the suitability determined by the suitability determining unit. The suitability determining unit determines, by referring to a correspondence relationship, suitability based on clarity improvement amount for speech sound corresponding to the determined hearing ability type, the correspondence relationship indicating, for each hearing ability type, degree of perceived speech clarity improvement by the dichotic hearing assistance.
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