Keiko Hattori made her debut concert appearance at the 19th World Conference of the International Society for Music Education in Finland at 11 years old. After studying at the National University of Fine Arts and Music in Tokyo, where she graduated with distinction in 2001, she went on to the Mozarteum in Salzburg. She has been a scholarship student of the Japanese Rohm Music Foundation since 2005. In June 2003 she was a guest at the Wilhelm Kempff Foundation in Positano, Italy. Keiko Hattori has already won several renowned competition prizes, including first prize in all categories (solo piano, song duo and chamber music) at the 17th International Schubert Competition 2004 in Italy.
Furthermore she performed at many international festivals. In 2004 she established the Pamina Trio (piano, clarinet, violin) with which she is also a multiple international prize winner.