Mari Adachi born in Tokyo, Japan. She began the violin at the age of four.
She studied violin and viola at the Toho Gakuen Music School and she has been pursuing her career in viola since 2004. She studied chamber music at the Vienna University of Music and Performing Arts. In 2013 she graduated with the highest mark and distinction on her Master Diploma and in 2015 she graduated for her Soloist Master Diploma at The Lausanne Conservatory.
She got the excellent performance Award at the Kirishima International Music Festival, 1st prize at Osaka International Music Competition ensemble department. At the International Academy in Semmering in Austria, she won the soloist prize.
As soloist she has appeared with Baden-Baden Philharmonie, Lausanne Chamber Orchestra etc.
She played the principal viola in Seiji Ozawa Music School projects in Japan and China with Seiji Ozawa. She performed as a member of Camerata de Lausanne directed by Pierre Amoyal in Switzerland, France, Turkey, Russia. She played in Bamberg Symphony as a guest principal violist and since 2013 she was the associate principal violist at the Tirol Symphony Orchestra in Innsbruck in Austria. Since 2016 she has been a member of Estonian Festival Orchestra directed by Paavo Järvi.
Currently she is based in Tokyo and passionate about new projects as a solist and also as a chamber musician such as Amity Quartet and Ensemble FOVE.
In 2018, she has released her debut CD "Winterreise" with Ryoko Fukasawa.