The purpose of the present invention is to provide a puncture device having excellent convenience during use. A puncture device (100) has: a puncture needle (30) provided with a main body part (10) capable of adhering to an organism, an outer needle (31), and an inner needle (32) inserted into the outer needle (31) a housing (40) configured so as to be capable of connecting to and separating from the main body part (10), the housing (40) for accommodating the puncture needle (30) and a puncture mechanism (60) for performing a puncture operation for causing the puncture needle (30) to protrude from the main body part (10), then making the inner needle (32) able to withdraw from the outer needle (31) while the outer needle (31) remains in a protruding state, the puncture mechanism (60) being provided in the housing (40). The main body part (10) and the housing (40) are disconnected following the puncture operation performed by the puncture mechanism (60).
