The development of the anthropomorphic flutist robot, at Waseda University, has focused on imitating the human flute playing by mechanically reproducing the organs involved during such activity. Our research aims in understanding several aspects of the human flute playing: Clarifying the human motor control while performing skillful activities, enabling robots to express ideas and feelings in musical terms and proposing new ways of interaction between the human and the robot. In this paper the new version of the flutist robot, the Waseda Flutist Robot No. 4 Refined II, is presented. The improvements of the mechanical system in order to improve the sound clarity of the robot’s performance and to enhance the interaction with humans are described. A set of experiments were carried out to verify the effectiveness of the mechanical components. As a result, the robot is able of performing a musical score with more clarity and furthermore, the robot can interact with humans more natural using the vision system.