A lancet pricking device comprising a lancet, a launching spring and a lancet holder for housing therein the lancet and the launching spring. The lancet pricking device of the present invention is characterized in that the lancet comprises a lancet body, a lancet cap and a pricking needle, and the pricking needle is disposed in both the lancet body and the lancet cap wherein the launching spring is attached to the lancet body, and the lancet body is secured by abutting against the lancet holder such that the launching spring is kept compressed before a pricking operation and wherein, when the lancet cap is removed, the lancet body becomes capable of warping upon being pressed from an outside to cause the secured lancet body to be released.
