The present invention relates to a controlling apparatus for bending the tube of an endoscope, in which the tube of the endoscope is consisted of different rigid and soft parts. The tail portion of the tube is provided at least with a soft foldable ring and other rigid portion becomes a support base. A slot is formed in the tube for receiving a controlling slice, which has an elastic end being bent in tenseness and the other end extending into a handle to engage with a teeth piece. A gear set provided within the handle engages with the teeth piece. By turning the gear set, it can move the teeth piece as well as the controlling slice toward the tail portion of the tube to control the tail portion being bent under simple operation. When the controlling slice moves towards the handle and is apart from the soft foldable ring of the tube, the tail portion will be recovered flatly because of being lack of elastic force. It therefore obtains improvement and utility that the present invention is capable of bending the tail portion of the tube easily.
