An endoscope puncture needle comprising: an outer sheath which is insertable into a channel of an endoscope and has a coil shape; a needle tube having a needle tip and arranged inside the outer sheath ; and an operation section connected to a proximal end of the outer sheath and configured to advance and retract the needle tube with respect to the outer sheath , wherein the operation section includes: an operation main body connected to the proximal end of the outer sheath ; a needle slider connected to a proximal end of the needle tube and provided to be movable along a longitudinal axis of the operation main body with respect to the operation main body ; and an engaging mechanism in which the needle slider is engaged to the operation main body in a longitudinal axial direction of the operation main body , characterized in that the endoscope puncture needle further comprises: a proximal-end-side inner tube arranged at an inside of a proximal end of the outer sheath and made of plastics; and a distal-end-side inner tube arranged at an inside of a distal end section of the outer sheath , through which the needle tube is insertable, and made of plastics, the distal-end-side inner tube having an inner circumferential surface that is relatively harder than the proximal-end-side inner tube , and a distal end of the needle tube is arranged inside the distal-end-side inner tube when the needle slider is engaged to the operation main body . an outer sheath which is insertable into a channel of an endoscope and has a coil shape; a needle tube having a needle tip and arranged inside the outer sheath ; and an operation section connected to a proximal end of the outer sheath and configured to advance and retract the needle tube with respect to the outer sheath , wherein the operation section includes: an operation main body connected to the proximal end of the outer sheath ; a needle slider connected to a proximal end of the needle tube and provided to be movable along a longitudinal axis of the operation main body with respect to the operation main body ; and an engaging mechanism in which the needle slider is engaged to the operation main body in a longitudinal axial direction of the operation main body , an operation main body connected to the proximal end of the outer sheath ; a needle slider connected to a proximal end of the needle tube and provided to be movable along a longitudinal axis of the operation main body with respect to the operation main body ; and an engaging mechanism in which the needle slider is engaged to the operation main body in a longitudinal axial direction of the operation main body , characterized in that the endoscope puncture needle further comprises: a proximal-end-side inner tube arranged at an inside of a proximal end of the outer sheath and made of plastics; and a distal-end-side inner tube arranged at an inside of a distal end section of the outer sheath , through which the needle tube is insertable, and made of plastics, the distal-end-side inner tube having an inner circumferential surface that is relatively harder than the proximal-end-side inner tube , and a distal end of the needle tube is arranged inside the distal-end-side inner tube when the needle slider is engaged to the operation main body . a proximal-end-side inner tube arranged at an inside of a proximal end of the outer sheath and made of plastics; and a distal-end-side inner tube arranged at an inside of a distal end section of the outer sheath , through which the needle tube is insertable, and made of plastics, the distal-end-side inner tube having an inner circumferential surface that is relatively harder than the proximal-end-side inner tube , and a distal end of the needle tube is arranged inside the distal-end-side inner tube when the needle slider is engaged to the operation main body . <EOS>