The present invention relates to an improved turning structure of endoscope device, which comprises at least two pull wires and a turning module. In which, the pull wire has a lower half portion and an upper half portion. The turning module is connected with a lens module and a probing flexible tube, and comprises a first and a second hollow gear and curved ribs. The first hollow gear is provided with a first and a second notch, wherein the tooth roots at the bottom of the first and second notches are pressed against the lower half portion of the pull wire. The second hollow gear is adjacent to the first hollow gear, and comprises a third and a fourth notch, wherein the tooth roots at the bottom of the third and fourth notches are pressed against the upper half portion of the pull wire. The curved ribs are connected with the first hollow gear and the second hollow gear as a whole, and may be bent in both clockwise and counterclockwise directions.一種內視鏡轉向結構改良其包括至少二拉線及一轉向模組,拉線具有拉線下半部及拉線上半部,轉向模組連接鏡頭模組及探測撓管,轉向模組具有第一、第二中空齒輪及彎向肋條。第一中空齒輪具有第一、第二齒槽,第一齒槽及第二齒槽底部之齒根壓抵拉線下半部。第二中空齒輪係相鄰於第一中空齒輪,第二中空齒輪具有第三齒槽及第四齒槽,該第三齒槽及該第四齒槽底部之齒根壓抵拉線上半部。彎向肋條一體連接第一中空齒輪及第二中空齒輪,彎向肋條係順時針及逆時針兩方向彎折。2‧‧‧拉線21‧‧‧拉線下半部22‧‧‧拉線上半部3‧‧‧轉向模組31‧‧‧第一中空齒輪311‧‧‧第一凸齒312‧‧‧第二凸齒313‧‧‧第三凸齒314‧‧‧第一齒槽315‧‧‧第二齒槽316‧‧‧齒根32‧‧‧第二中空齒輪321‧‧‧第四凸齒322‧‧‧第五凸齒323‧‧‧第六凸齒324‧‧‧第三齒槽325‧‧‧第四齒槽326‧‧‧齒根33‧‧‧彎向肋條331‧‧‧短面332‧‧‧長面
