[Problem] It is possible to produce hollow microneedles using workpiece containing macromolecules as a major component.[Solution] A method of producing microneedles in the present invention includes a molding step of passing a thin pillar array member through through-holes to be used for positioning, and determining the shape of microneedles in the state where the pillar array member penetrates a liquid macromolecular compound in a liquid and semi-liquid state, a solidification step of solidifying the macromolecular compound, and a pull-out step of pulling out the pillar array member.
