An endoscopic treatment tool includes: a needle tube in which a needle tube insertion passage extending from a distal end to a proximal end of the needle tube is formed; a stylet which is disposed to move freely in the needle tube insertion passage; a main manipulation part which is connected to a proximal end side of the needle tube, the main manipulation part supporting the stylet such that the stylet advances while rotating, and the main manipulation part operating the stylet; a manipulation transmission member which has flexibility and the manipulation transmission member is connected to the stylet; and an auxiliary manipulation part which includes a handle fixed to a proximal end portion of the manipulation transmission member and the auxiliary manipulation part is configured such that the manipulation transmission member advances while rotating in accordance with a manipulation of the handle.