1. Introduction: We can still find Machiyas (Machiya: old Kyoto-style townhouse), that retain traditional style in the modern-day city of Kyoto, and such Machiyas and others are being registered/designated as cultural properties, or designated as historic designed buildings to symbolize them in the cityscape scenery. One of the most attractive factors in Machiya is, on top of its appearance, its interior. This study focuses on commercial-use Kyo-Machiyas in the central city of Kyoto, and discusses about interior design concept, architectural style characteristics, and the inheritance of traditional style, with the objective of understanding the current status and trend. 2. Study method: Subjects of investigation in this study are so-called “Kyo- Machiyas” which have been continually changing to fit culture and climate of Kyoto. Area of investigation is the inner area, which is packed with a variety of businesses, the center of development of bourgeois culture of Kyoto, and now recognized as a heart of commercial urban area in modern-day Kyoto. 3. Overview of Machiya-use-type commercial spaces surveyed: An overview of 61 cases included in the surveys is described. 4. Interior characteristics: Walls and ceilings are mostly Japanese-style. Floor finishes are selected according to the use of space in many cases. Fixtures are mostly Japanese-style. Traditional fixtures characteristic to Kyo-Machiya, such as Degoushi (latticed bay window) and wooden framed windows are retained in many cases and a marked inheritability was found. Many of lighting apparatuses and shelves are categorized as others (general ready-made products). 5. Trends in design of Machiya-use-type commercial space: A scatter chart by Quantification method III using design characteristics shows appearance as categories. Inheritability was assigned to the horizontal axis and unpredictability was assigned to the vertical axis, and the classification was made into four attributes of Kyo-Machiya, fusion, modern-Machiya, and function-oriented. 6. Summary: 1) Interior characteristics show a marked tendency of typical Machiya-style inheritance in fixtures and in finishes of ceilings and walls. Furniture is differentially used according to the owner’s concept and use. 2) Design of Machiya-use-type commercial space can be classified into two axes of inheritability and unpredictability, and into four attributes.