A piercing device and a blood inspection device that have increased safety. The piercing device (111) has a piercing button (113) placed on the front surface of a first case (112a), a base (114) being a piecing opening provided projecting from the front surface of the first case (112a), and a laser emission device (115) received in the first case (112a). First safety means (117) prevents emission of a laser beam (115a) to the outside when the first case (112a) and a second case (112b) are superposed on each other. When the base (114) is depressed after the second case (112b) is moved from the superposed state where the second case (112b) is superposed on the first case (112a) to a non-superposed state where the second case (112b) is not, a switch (114b) detects the depression of the base (114) and second safety means (118) to enable depression of the piercing button (113).
