PROBLEM TO BE SOLVED: To provide an endoscope device that allows a directional direction on a tip end side of a sheath to be easily varied even in a large space, and easily allows for an observation in a wide range.SOLUTION: Provided are: a tip end side guide 3 which is provided on a tip end side of a sheath 1, of which, after inserted inside the analyte, one surface 3d is configured to abut against a bottom surface 200b in an analyte by a setting length, and which is capable of being freely curved only in one direction A where the one surface 3b is a circumcircle and other surface 3j is an incircle and an at-hand side guide part 5 that is provided on a base end side further than the tip end side guide 3 in the sheath 1. By a rotation of the at-hand side guide 5i, the tip end side guide 3 rotates and moves the bottom surface 200b to one side C1 in a direction C or other side C2 in the direction C, and rotation force is given to the tip end side guide 3, the one surface 3b and the other surface 3j are configured to be curved in one direction A in a state where the one surface 3b and the other surface 3j stand up from the bottom surface.
