a lancing device comprising : a cover section , a part of which is provided with an opening ; a main body held on the cover section and configured to be movable in a predetermined direction from the opening relative to the cover section ; a lancing unit which is launched in the predetermined direction ; and an operating section configured to launch the lancing unit when the operating section is pushed by applying a force in the predetermined direction , wherein the lancing unit is launched when the force is applied to the operating section in the predetermined direction with regulating a movement of the main body in the predetermined direction , and the main body moves , instead of pushing the operating section , by applying the force in the predetermined direction without regulating the movement of the main body in the predetermined direction is disclosed .