To provide a puncture device in which an inner needle (3) is accommodated in an inner needle hub (41) by pulling operation of an inner needle, a through hole for inserting the inner needle is blocked, and the inner needle is prevented from protruding outside. The puncture device includes an outer pipe (6) fitted inside the inner needle hub (41) so as to be freely moveable, and an inner pipe (7) fitted inside the outer pipe (6) so as to be freely moveable, which has a through hole (73) for inserting the inner needle (3). The inner pipe (7) includes a through hole block means (space 75, the block body 74) for blocking communicated condition of the through hole, which makes at least part of the through hole move from a position where the inner needle (3) is inserted to a position where the inner needle (3) is blocked.
