An endoscopic treatment tool includes: a sheath in which a lumen is formed; a treatment part which is inserted into the lumen and is configured to protrude and retract from a distal end of the sheath; a main manipulation part which is connected to the proximal end side of the sheath and allows the treatment part to perform a first motion and a second motion; an auxiliary manipulation part which is disposed to be separate from the main manipulation part and is configured to perform the first motion of the treatment part and configured to put the second motion out of action; and a manipulation transmission member which is made of a flexible member, connects the auxiliary manipulation part to the main manipulation part, and transmits a manipulation input of the auxiliary manipulation part with respect to the main manipulation part.