Puncture set

A puncture set comprising:

• a puncture needle unit having a puncture needle including a needle body having a sharp needle point at a distal end thereof and a needle hub fixed to a proximal end of the needle body, and a tubular casing housing the puncture needle longitudinally movably therein and having an opening through which the needle point can project;
• and
• a puncture device having a housing, a ring-shaped mount disposed on a distal end portion of the housing for holding the casing removably mounted therein, and a plunger housed in the housing and having a coupling for being coupled to the needle hub in a mounted state in which the casing is mounted in the mount,
• wherein the casing has a plurality of casing protrusions that project on an outer circumferential surface thereof and which are disposed circumferentially along the outer circumferential surface, and the mount has a plurality of mount protrusions that project on an inner circumferential surface thereof and which are disposed circumferentially along the inner circumferential surface, at least one of the mount protrusions being positioned between an adjacent two of the casing protrusions in the mounted state.