Provided is an endoscope which can securely hold a guide wire at a predetermined position in a distal end portion of an insertion portion of the endoscope, and which can secure a sufficient securing strength. The endoscope includes an insertion portion which has a distal end hard portion at a distal end side and a treatment instrument insertion channel inside, and which is inserted into a body cavity, an operation portion which is connected to a proximal end side of the insertion portion, and a treatment instrument raiser which is arranged near a distal end side opening of the treatment instrument insertion channel and has a treatment instrument guiding surface for guiding a treatment instrument and which is raised by an operation from the operation portion. The treatment instrument raiser has a slit which is formed at a distal end side of the treatment instrument guiding surface and with which a guide wire guided toward the distal end side opening of the treatment instrument insertion channel can be engaged, and a guide wire guiding unit which is formed at an outer periphery of the treatment instrument guiding surface to guide the guide wire to the slit. When the treatment instrument raiser is raised by the operation from the operation portion, the guide wire is guided to the slit by the guide wire guiding unit.
