[Problem] To fabricate needle portions each having a tip with appropriate dimension and shape and improve puncture properties. [Solution] A method for manufacturing a needle-like structure includes: a step of forming, for a surface of a substrate 11, a plurality of first linear grooves 12 parallel to each other, the first linear grooves being formed along a first direction by means of grinding, to thereby form a plurality of projections 15 each having a triangular cross section perpendicular to the first direction and a step of forming, for each of the projections 15, a plurality of second linear grooves 14 parallel to each other, the second linear grooves being formed along a second direction intersecting the first direction by means of grinding so as to have a depth smaller than that of the first linear grooves 12, to thereby form a plurality of needle portions 15 each having a triangular cross section perpendicular to the second direction.
