An endoscope includes a therapeutic instrument controlling base which is arranged to the distal portion of the inserting portion and controls such that a therapeutic instrument projected from the opening of a channel for inserting the therapeutic instrument at the distal portion of the inserting portion moves in the right and left directions of an observed image obtained by an observing unit, a controlling-base operating unit which is arranged to an operating section continuously arranged to the proximal side portion of the inserting portion and which can be operated in the right and left directions of an operator who grips the operating section, and a controlling-base operating mechanism which controls such that the therapeutic instrument controlling base moves in the right direction of the observed image according to the operation of the controlling-base operating unit in the right direction thereof by the operator who grips the operating section and controls such that the therapeutic instrument controlling base moves in the left direction of the observed image according to the operation of the controlling-base operating unit in the left direction.