There is provided an endoscope and a treatment tool-standing mechanism that allows a distal-end-portion body to be reduced in size while ensuring good operability of a standing base. In a distal-end-portion body 30 of an endoscope, a standing lever 82 is connected to a standing base 60 through a rotating shaft, and the standing base 60 is rotated by the rotation of the standing lever 82 about the rotating shaft that is caused by the push and pull of an operation wire. The standing lever 82 includes a first arm portion 83 that extends from the rotating shaft and a second arm portion 84 that extends in a direction different from the direction of the first arm portion 83, and a useless space formed on the proximal end side of the distal-end-portion body 30 is reduced depending on the shape of the standing lever 82.
