Nikko Seiki Co., Ltd. is a Japanese precision instruments manufacturer based in Tokyo, founded in 1953 and specializing in mechanical metronomes under the Nikko name since 1961. The company describes itself as the only specialist manufacturer of mechanical metronomes in Japan, with all parts assembled by hand at its domestic factory.

Nikko's catalog is built around spring-powered pendulum metronomes that require no batteries and use hardened metal core parts designed for long service life. The lineup includes the entry-level Standard and Standard plus models, the metallic-finish Lamiere, Large Font and Clear Font variants intended for improved tempo readability, a Pouch model, and several wooden-cased designs such as the Wooden Jumbo, Wooden Regular, Wooden So, and Wooden mini advance, along with the lacquered Tamamushi Lac finish. The Standard model covers a tempo range of roughly 40 to 208 BPM and is offered in a variety of colorways.

Nikko metronomes are widely stocked by music schools and instrument retailers across Japan, the rest of Asia, North America, and Australia, and are a common recommendation for piano, string, and wind students who prefer an acoustic pendulum click over digital alternatives.

Nikko has 2 products cataloged on Equipboard.