A surgical instrument is disclosed that includes: a handle a shaft coupled to the handle and extending in one direction a bending part formed on a portion of the shaft a driving part mounted on the handle and configured to generate a particular driving power and a power transmission mechanism configured to transmit the driving power generated by the driving part to the bending part such that the bending part is bent. By mounting a driving part onto the surgical instrument and enabling the shaft to bend by a simple manipulation on a controller, it is possible to readily change the direction of the effector even when holding the instrument in one hand. Also, since the shaft is bent while the instrument is held, the reaction force applied on the effector when changing the direction of the effect can be felt by the user, providing a “haptic feedback”.
