Provided is a puncturing instrument capable of administering (supplying) a liquid drug. The puncturing instrument comprises: a puncturing tip (2)； a first tubular body (3) connected to the puncturing tip (2) at the distal end thereof； and an outside tubular body (5) covering at least part of the first tubular body (3). The first tubular body (3) is formed so as to be rotatable around a shaft in the longitudinal direction. The outer diameter of the first tubular body (3) is smaller than the inner diameter of the outside tubular body (5) and a liquid drug supply path (5a) is provided on the outside of the first tubular body (3).
