新井ビル, Commercial building in Chūō-ku district, Japan

The Arai Building is a historic structure in Chūō-ku, Osaka, designed by Kawai Kōzō and built as the Osaka branch of the Hōtoku Bank. Its ground floor is granite masonry, the upper floors are tiled, and a colonnade stands at the centre of a symmetrical facade. Two entrances flank the front: the left leads to a ground-floor patisserie, the right to offices on the third and fourth floors.

The Arai Building was designed by Kawai Kōzō, an architect involved in Tokyo's government-district planning, and built as the Osaka branch of the Hōtoku Bank. After the bank failed in the Shōwa financial panic, the securities firm founded in Kitahama in 1927 by Arai Suekichi acquired the building in 1934, moved its head office there and gave it its name. During World War II the balcony railings and elevators were removed under the metal collection ordinance.

The name comes from Arai Suekichi, who founded Arai Securities in Kitahama in 1927 and moved its head office into this building in 1934. The ground-floor banking hall now holds the patisserie Gokan, with its tea salon on the first floor above.

The building stands in Chūō-ku, a two-minute walk from Kitahama Station on the Sakaisuji subway line and the Keihan main line. The ground-floor confectionery and the second-floor café salon are open to customers; the offices on floors three and four and the basement barbershop are not open to visitors.

The building was selected for the Living Architecture Museum Osaka selection, a programme of the Japan Institute of Architects' Kansai chapter. Its survival is owed to a 1976 intervention: when a plan to replace it with an eight-storey block was drafted, the Architectural Institute of Japan, approached through architect Kiyoshi Seike, requested its preservation and the plan was withdrawn.