A puncture needle for an endoscope used with an endoscope having a treatment tool insertion channel, a raising base configured to raise a treatment tool inserted through the channel, and an observation optical system, the puncture needle for an endoscope comprising: a coil sheath having an outer diameter that is capable of being inserted into the treatment tool insertion channel and constituted by a wire wound as a coil shape along a longitudinal axis thereof; a needle tube having a needle tip formed at a distal end thereof and movable along the longitudinal axis of the coil sheath inside the coil sheath; a manipulation section provided at a proximal portion of the coil sheath; a needle slider disposed at the manipulation section and configured to advance and retract the needle tube by advance and retract manipulation with respect to the manipulation section; a needle slider engaging section disposed at the manipulation section and abutting the needle slider when the needle slider is retracted to a proximal side; and an inner sheath having a distal end, a proximal end, an outer circumferential surface configured to cover a gap between the neighboring loops of the wire of the coil sheath between the distal end and the proximal end inside of the coil sheath, and an inner circumferential surface configured to form an insertion path into which the needle tube is capable of being inserted, wherein, in a state in which a distal end of the coil sheath is located in an observation field of the observation optical system and the needle slider is retracted to abut the needle slider engaging section, the distal end of the inner sheath is located closer to a distal side than a proximal end of the raising base in the coil sheath, and the proximal end of the inner sheath is located closer to a proximal side than a needle tip of the needle tube in the coil sheath. a coil sheath having an outer diameter that is capable of being inserted into the treatment tool insertion channel and constituted by a wire wound as a coil shape along a longitudinal axis thereof; a needle tube having a needle tip formed at a distal end thereof and movable along the longitudinal axis of the coil sheath inside the coil sheath; a manipulation section provided at a proximal portion of the coil sheath; a needle slider disposed at the manipulation section and configured to advance and retract the needle tube by advance and retract manipulation with respect to the manipulation section; a needle slider engaging section disposed at the manipulation section and abutting the needle slider when the needle slider is retracted to a proximal side; and an inner sheath having a distal end, a proximal end, an outer circumferential surface configured to cover a gap between the neighboring loops of the wire of the coil sheath between the distal end and the proximal end inside of the coil sheath, and an inner circumferential surface configured to form an insertion path into which the needle tube is capable of being inserted, wherein, in a state in which a distal end of the coil sheath is located in an observation field of the observation optical system and the needle slider is retracted to abut the needle slider engaging section, the distal end of the inner sheath is located closer to a distal side than a proximal end of the raising base in the coil sheath, and the proximal end of the inner sheath is located closer to a proximal side than a needle tip of the needle tube in the coil sheath. the distal end of the inner sheath is located closer to a distal side than a proximal end of the raising base in the coil sheath, and the proximal end of the inner sheath is located closer to a proximal side than a needle tip of the needle tube in the coil sheath.