An endoscope includes: an endoscope operation portion； a first grasping portion configured to enable the endoscope operation portion to be grasped in a first grasping state； a second grasping portion configured to enable the endoscope operation portion to be grasped in a second grasping state； and attaching portion mounting portions to which an attaching portion of a treatment instrument operation portion is attached so as to enable an operation of the bending operation lever and an operation of a slider provided to the treatment instrument operation portion of the treatment instrument to be performed with fingers of a hand grasping the first grasping portion or the second grasping portion, the attaching portion mounting portions being formed respectively on the first grasping portion and the second grasping portion.
