An applicator adapted for being inserted into a living body including: a nozzle which has a nozzle main body, and a nozzle head, which is provided on a front end side of the nozzle main body and which is suitable to expel liquid or powder together with gas, with a curved section, which is curved or bent and has flexibility, being formed on the front end portion of the nozzle main body; and an outer tube through which the nozzle main body is inserted so as to be movable along a longitudinal direction thereof and a shape of the curved section is corrected by inserting the curved section, thereby adjusting a direction of the nozzle head relative to an axis of the nozzle main body, wherein a gap is formed along the longitudinal direction between the outer tube and the nozzle, and wherein the gap is suitable to function as a discharge path for discharging the gas within the body cavity via the gap to the outside of the body when the body pressure within the body cavity rises, wherein the applicator further includes a positioning means (16, 16a) for positioning the outer tube with respect to the longitudinal direction of the nozzle, characterized in that the positioning means (16, 16a) includes an elastic body which is fixed with respect to one surface of an outer peripheral surface of the nozzle main body and an inner peripheral surface of the outer tube in the middle of the gap and comes into contact with the other surface thereof. a nozzle which has a nozzle main body, and a nozzle head, which is provided on a front end side of the nozzle main body and which is suitable to expel liquid or powder together with gas, with a curved section, which is curved or bent and has flexibility, being formed on the front end portion of the nozzle main body; and an outer tube through which the nozzle main body is inserted so as to be movable along a longitudinal direction thereof and a shape of the curved section is corrected by inserting the curved section, thereby adjusting a direction of the nozzle head relative to an axis of the nozzle main body, wherein a gap is formed along the longitudinal direction between the outer tube and the nozzle, and wherein the gap is suitable to function as a discharge path for discharging the gas within the body cavity via the gap to the outside of the body when the body pressure within the body cavity rises, an outer tube through which the nozzle main body is inserted so as to be movable along a longitudinal direction thereof and a shape of the curved section is corrected by inserting the curved section, thereby adjusting a direction of the nozzle head relative to an axis of the nozzle main body, wherein a gap is formed along the longitudinal direction between the outer tube and the nozzle, and wherein the gap is suitable to function as a discharge path for discharging the gas within the body cavity via the gap to the outside of the body when the body pressure within the body cavity rises, wherein the applicator further includes a positioning means (16, 16a) for positioning the outer tube with respect to the longitudinal direction of the nozzle, characterized in that the positioning means (16, 16a) includes an elastic body which is fixed with respect to one surface of an outer peripheral surface of the nozzle main body and an inner peripheral surface of the outer tube in the middle of the gap and comes into contact with the other surface thereof. a positioning means (16, 16a) for positioning the outer tube with respect to the longitudinal direction of the nozzle, characterized in that the positioning means (16, 16a) includes an elastic body which is fixed with respect to one surface of an outer peripheral surface of the nozzle main body and an inner peripheral surface of the outer tube in the middle of the gap and comes into contact with the other surface thereof.