An endoscope comprising: a bendable section configured to be inserted into a subject's body to collect image information; and a power transmission means configured to transmit power provided by a power source to the bendable section for performing a bending motion, a control body connected to the bendable section and configured to control the bending motion of the bendable section and a connector connected to the control body, wherein one side of the power transmission means is connected to the connector, and the other side of the power transmission means extends through the control body and is connected to the bendable section, wherein the power transmission means comprises a power-transmitting mechanical cord and a friction control part configured to promote or restrain a movement of the mechanical cord, wherein the power transmission means comprises a guide tube surrounding the mechanical cord to guide the same, wherein the friction control part comprises an end holding part connected to one end of the guide tube from which the mechanical cord is drawn and a fixing means on which the end holding part is disposed, characterised in that the friction control part is configured to control friction occurring during the movement of the mechanical cord by adjusting the diameter of the guide tube or a tension of the guide tube, and in that the fixing means comprises a fixed block and a fixing bracket fixing the end holding part to the fixed block, the fixed block comprises a partition provided on one side thereof and supporting the end holding part and a plurality of fastening holes sequentially provided in the partition, and the fixing bracket is fixedly fitted to one of the plurality of fastening holes using a fastening means. a bendable section configured to be inserted into a subject's body to collect image information; and a power transmission means configured to transmit power provided by a power source to the bendable section for performing a bending motion, a control body connected to the bendable section and configured to control the bending motion of the bendable section and a connector connected to the control body, wherein one side of the power transmission means is connected to the connector, and the other side of the power transmission means extends through the control body and is connected to the bendable section, wherein the power transmission means comprises a power-transmitting mechanical cord and a friction control part configured to promote or restrain a movement of the mechanical cord, wherein the power transmission means comprises a guide tube surrounding the mechanical cord to guide the same, wherein the friction control part comprises an end holding part connected to one end of the guide tube from which the mechanical cord is drawn and a fixing means on which the end holding part is disposed, characterised in that the friction control part is configured to control friction occurring during the movement of the mechanical cord by adjusting the diameter of the guide tube or a tension of the guide tube, and in that the fixing means comprises a fixed block and a fixing bracket fixing the end holding part to the fixed block, the fixed block comprises a partition provided on one side thereof and supporting the end holding part and a plurality of fastening holes sequentially provided in the partition, and the fixing bracket is fixedly fitted to one of the plurality of fastening holes using a fastening means.