  We report results on studies of CP violation in the three-body charmless
decay B+- => K+-pi+-pi-+. Evidence at the 3.9sigma level for large direct CP
violation in B+- => rho(770)0K+-$ is found. This is the first evidence for CP
violation in a charged meson decay. The analysis is performed using Dalitz
analysis technique with a data sample that contains 386 million BBbar pairs
collected near the Y(4S) resonance, with the Belle detector operating at the
KEKB asymmetric energy e+ e- collider.
