Method for manufacturing microprojection unit, and microprojection unit

A method for manufacturing a microprojection unit that includes

• a microprojection tool including, on a base, a protrusion with a hollow interior, and
• a base component having a liquid retention space that is in communication with the interior of the protrusion through the base, the microprojection tool being joined to a tip end of the base component,
• the manufacturing method comprising:
• a microprojection tool forming step of forming the microprojection tool by
• bringing a projecting mold part into contact from one surface side of a base sheet including a thermoplastic resin, and thus forming a protrusion that protrudes from another surface side of the base sheet, and
• withdrawing the projecting mold part from the interior of the protrusion;
• and
• a joining-cutting step of joining the one surface side of the base sheet, in which the microprojection tool has been formed, and the tip end of the base component, and simultaneously cutting the base sheet, along a contour of the base component at a position more inward than the base component's contour in a planar view of the base sheet as viewed from the microprojection tool side, to manufacture the microprojection unit.

A microprojection unit comprising:

• a microprojection tool including, on a base, a protrusion with a hollow interior;
• and
• a base component having a liquid retention space that is in communication with the interior of the protrusion through the base, the microprojection tool being joined to a tip end of the base component, wherein
• when a liquid is introduced into the liquid retention space of the base component and inner pressure is applied, a region where the protrusion is provided in the microprojection tool's base bends so as to project outward.