An endoscope insertion portion is characterized by comprising an insertion tube portion (16), a bending portion (14) which is connected to a distal end of the insertion tube portion (16), and is operated to be bent, an operation wire (36a) which is inserted through the bending portion (14) and insertion tube portion (16), and is operated to move forward and backward to operate the bending portion (14) to be bent, a distal end side wire guide (40a) which is provided over a distal end side of the operation wire (36a), and a portion of which is fixed to the bending portion (14), a proximal end side wire guide (40b) which is provided over a proximal end side of the operation wire (36a), and a portion of which is fixed to the insertion tube portion (16), a distal end side abutting portion (44a, 60a) provided at a proximal end of the distal end side wire guide (40a), and a proximal end side abutting portion (44b, 60b) which is provided at a distal end of the proximal end side wire guide (40b), and brought into abutment with the distal end side abutting portion (44a, 60a) when the operation wire (36a) is moved backward so that the bending portion (14) is bent.
