By moving a control member (3) in a predetermined direction from a wait position, a lancing device (A) can perform a lancet retreat operation for retreating a lancet holder (2) to locate a lancet (9) at a predetermined retreated position and a lancet detachment operation for pushing out the lancet (9) forward of the lancet holder (2) after a lancing operation. The control member (3) returns to the wait position by action of a return member (7) both after the lancet retreat operation and after the lancet detachment operation. Thus, the lancing device (A) is convenient.
