An applicator comprises a transmission member, a housing guiding a reciprocation of the transmission member, and a cap covering the housing. The transmission member is provided with a stopper extending in a direction orthogonal to an axial direction thereof. An upper end of the housing is formed with a projection sliding the stopper. The inside of the cap is formed with a lead part. The stopper is slid by the lead part to an end part of the projection when the cap is pushed and thereafter disengages from the projection when the cap is further pushed, so that the transmission member transmits the biasing force of an elastic member to a microneedle. This enables the microneedle to be applied to a skin.
