PROBLEM TO BE SOLVED: To provide a supplementary observation device for an endoscope, capable of observing the inside of an intestinal tract before an endoscope observation carried out while taking out an endoscope insertion part from the intestinal tract.SOLUTION: An overtube 2 includes: a prescribed insertion pipe section 21 having an endoscope insertion hole 2a into which an endoscope insertion part 11 is inserted and an observation device moving part 2b which is provided integrally with the insertion pipe section 21, in which an observation portion 3a is arranged that includes an imaging element 3e and a light emitting element 3f for observing the peripheral direction of the insertion pipe section 21, and which includes a path enabling the observation portion 3a to move from one end of the insertion pipe section 21 to the other end thereof.COPYRIGHT: (C)2013,JPO&INPIT【課題】内視鏡挿入部を体管内から抜去しながら行う内視鏡観察前に体管内の観察を可能にする内視鏡用補助観察装置を提供すること。【解決手段】オーバーチューブ2は、内視鏡挿入部11が挿通される内視鏡挿通孔2aを有する予め定めた挿入管部21と、挿入管部21に一体に設けられ、挿入管部21の外周方向を観察するための撮像素子3e及び発光素子3fを備える観察部3aが配置され、観察部3aの挿入管部21の一端側から他端側までの移動を可能にする経路を備える観察装置移動部2bと、を具備している。【選択図】図6
