An endoscope system has a driving section of insertion section for driving an insertion-section of treating instrument having an instrument. The driving section of insertion section is supported by a pivoting section rotatively. The driving section of insertion section has two rollers facing each other. The insertion-section of treating instrument is disposed between the rollers. The insertion-section of treating instrument is extended or retracted by rotating the rollers if the rollers are disposed with respect to the extension/retraction direction. If the pivoting section is pivoted to be orthogonal to the extension/retraction direction, the insertion-section of treating instrument rotates around its axial line by the rotation of the rollers. By doing this, it is possible to rotate the instrument easily in the endoscope system for extending/retracting the instrument by electric power.
