A micro-needle array unit includes a micro-needle array a container which accommodates the micro-needle array and includes an accommodating portion having an opening and a protrusion that supports the outer peripheral surface of the micro-needle array, a deformation portion disposed on a side opposite to the opening and integrated with the accommodating portion, and a flange portion integrated with the accommodating portion and brought into contact with the skin and a lid which seals the opening of the container, in which the deformation portion is deformed and the other surface of the micro-needle array is pressed due to an external force being applied in a direction of the opening, the micro-needle array deforms the protrusions and is pushed to the outside from the accommodating portion by the pressing of the other surface of the micro-needle array, and the deformation portion maintains the deformed state and presses the micro-needle array.
