Masunaga Since 1905

Masunaga Eyewear & Premium Japanese Frames Founded in 1905 by Gozaemon Masunaga, Masunaga Optical pioneered luxury eyeglass manufacturing in Fukui, Japan. As the historic cradle of Japanese optical craftsmanship, the brand is globally renowned for handling all 200+ meticulous production steps entirely in-house—from raw materials to the final polish.
Spanning iconic releases from the premium K3 line to the Masters of Craft collection, Masunaga remains the only Japanese company featuring a completely integrated factory for unmatched quality control. Handcrafted using high-grade Japanese acetate and lightweight pure titanium, these designer eyeglasses and high-end sunglasses deliver flawless structural balance and absolute everyday comfort. Explore our curated catalog of authentic, world-class luxury frames below.