Psychederhythm is a boutique Japanese guitar and bass builder based in Ebisu, Shibuya-ku, Tokyo. The name is a contraction of "Psychedelic Rhythm," and the operation grew out of a small Tokyo shop that originally specialized in vintage instruments and repairs before moving into manufacturing under the direction of Noriyuki Ishida. Production is deliberately limited — guitars are typically assembled in short runs of just a few pieces per configuration, with custom orders taking roughly two to two and a half months from order to delivery.

The lineup centers on Fender-inspired designs, with the offset Psychomaster (Jazzmaster-style), Standard-T (Telecaster-style), Standard-J (Jazz Bass-style) and the Cheetah among the core models. The builds are known for their attention to finish work — vibrant metallics, 1960s-style custom colors, matching painted headstocks, and bound tops — combined with a focus on stage-ready playability, reflecting the company's stated goal of producing instruments a professional can take directly to a gig without on-site adjustment.

The brand has built its reputation largely by word of mouth among session players, touring musicians, and engineers in Japan, and its instruments are sold through higher-end Tokyo retailers such as G-Club, Kurosawa Music, and Ikebe, as well as via the shop's own storefront.

Psychederhythm has 6 products cataloged on Equipboard, including Solid Body Electric Guitars and Semi-Hollowbody Electric Guitars. Their gear is featured by 5 artists, with the strongest followings in Rock, Pop, and Electronic. Notable users include Motoki Omori, yuuho kitazawa, and Yojiro Noda.