Il nome significa "ala di aquila" in giapponese e si riferisce ad una concept car destinata ad accogliere sei persone in un ambiente molto confortevole.
La linea è sostanzialmente quella di una monovolume-coupè molto bassa e filante e con gli sbalzi, specialmente quello posteriore, ridotti al minimo.
Due telecamere sostituiscono i tradizionali specchietti retrovisori.

Mazda unveiled an innovative six-seat concept car at the 2003 North American International Auto Show today. Mazda Washu – which means "Eagle's Wing" in Japanese – is the first in a string of significant concept and production vehicles Mazda will unveil at auto shows throughout calendar year 2003. Together, these vehicles will showcase Mazda's commitment to swift and focused product development and offer global auto consumers a glimpse at the vehicles that will carry Mazda successfully through the end of the decade. The Mazda Washu concept demonstrates the company's innovative approach to vehicle/passenger interaction in a compelling, modernly proportioned vehicle.