An endoscope comprising: an insertion unit that includes a tip and a base end; a tip portion body that is provided on a tip side of the insertion unit; a standing base (50, 90) that is adapted to be rotatable in a receiving chamber provided in the tip portion body between a falling position and a standing position, thereby defining a moving path; an operation wire of which a tip side is connected to the standing base (50, 90); an operation wire-guide passage that is provided in the tip portion body to guide the operation wire to be inserted into an internal space of the insertion unit to the standing base (50, 90); and a stretchable coating member that has a bellows structure configured to contract and expand between said falling position and standing position, wherein the stretchable coating member covers the operation wire so as to extend in an extending direction of the operation wire and so as to allow the operation wire to be relatively movable over the entire region from a connection portion between the standing base (50, 90) and the operation wire to the operation wire-guide passage, wherein the coating member is disposed offset so as to be spaced apart from the moving path in a direction perpendicular to the moving path by a distance equal to or longer than a distance exceeding an diameter of the coating member in a case in which the coating member is contracted in the standing position, a tip of the coating member and the standing base are liquid-tightly fixed to each other and a base end of the coating member and the operation wire-guide passage are liquid-tightly fixed to each other, the coating member is disposed at a position where the coating member and a treatment tool led from a treatment tool-guide passage provided in the tip portion body do not interfere with each other, and characterised in that the standing position of the standing base (50,90) is a position where the standing base is raised to bring a tip portion of the standing base into contact with the tip portion body, the coating member and the operation wire are spaced apart from each other in a state in which the coating member is contracted, the operation wire is inserted at a position offset from a center axis of the coating member in a radial direction. an insertion unit that includes a tip and a base end; a tip portion body that is provided on a tip side of the insertion unit; a standing base (50, 90) that is adapted to be rotatable in a receiving chamber provided in the tip portion body between a falling position and a standing position, thereby defining a moving path; an operation wire of which a tip side is connected to the standing base (50, 90); an operation wire-guide passage that is provided in the tip portion body to guide the operation wire to be inserted into an internal space of the insertion unit to the standing base (50, 90); and a stretchable coating member that has a bellows structure configured to contract and expand between said falling position and standing position, wherein the stretchable coating member covers the operation wire so as to extend in an extending direction of the operation wire and so as to allow the operation wire to be relatively movable over the entire region from a connection portion between the standing base (50, 90) and the operation wire to the operation wire-guide passage, wherein the coating member is disposed offset so as to be spaced apart from the moving path in a direction perpendicular to the moving path by a distance equal to or longer than a distance exceeding an diameter of the coating member in a case in which the coating member is contracted in the standing position, a tip of the coating member and the standing base are liquid-tightly fixed to each other and a base end of the coating member and the operation wire-guide passage are liquid-tightly fixed to each other, the coating member is disposed at a position where the coating member and a treatment tool led from a treatment tool-guide passage provided in the tip portion body do not interfere with each other, and characterised in that the standing position of the standing base (50,90) is a position where the standing base is raised to bring a tip portion of the standing base into contact with the tip portion body, the coating member and the operation wire are spaced apart from each other in a state in which the coating member is contracted, the operation wire is inserted at a position offset from a center axis of the coating member in a radial direction.