PURPOSE: A surgical instrument, a robot arm, and a robot system including the same for a surgical operation are provided to easily perform the surgical operation using a surgical instrument for storing a plurality of effectors and/or the robot arm for storing a plurality of the surgical instruments.CONSTITUTION: A robot arm(32) is formed using a link device such as an interlocking device. The link device is controlled through a motor control type joint. The robot arm comprises a first robot arm(62), a second robot arm(64), a third robot arm(66), and a fourth robot arm(68). The robot arm comprises a loading unit(70), a loading unit central rotation shaft(74), a surgical instrument transport unit(78), and a cannula(72). The loading unit central rotation shaft rotates the loading unit. The cannula guides movements of a surgical instrument.COPYRIGHT KIPO 2012본 발명은 마스터 입력부, 마스터 입력부의 제어에 의해 동작하는 로봇 암 및 로봇 암에 연결되는 복수개의 수술기구를 포함하고, 로봇 암은 복수개의 수술기구를 적재하는 적재부와 체내에 삽입되어 수술기구의 이동가이드로 사용되는 캐뉼러를 포함하는 수술용 로봇 시스템을 제공한다.
