A micro-needle array unit (1, 2, 3, 4, 5, 6, 7, 8, 9) includes a micro-needle array (40) a container (10) which accommodates the micro-needle array and includes an accommodating portion (12) having an opening (12A) and a protrusion (12B) that supports the outer peripheral surface (42A) of the micro-needle array, a deformation portion (14) disposed on a side opposite to the opening and integrated with the accommodating portion, and a flange portion (16) integrated with the accommodating portion and brought into contact with the skin (60) and a lid (30) which seals the opening of the container, in which the deformation portion is deformed and the micro-needle array 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.
