An applicator which is used by being inserted into a living body includes: a nozzle which has a longer nozzle main body, and a nozzle head, which is provided on a front end side of the nozzle main body and through which liquid together with gas is expelled, 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 curve angle of the curved section is changed 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 functions 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.
