(adaptor) of an automatic injecting apparatus shown in FIGS. 11 and 13. [0078]FIG. 16 is an enlarged view of an adaptor. [0079]FIG. 17 is a schematic view of a flange of a syringe barrel, which is raised from right position and displaced from a cylinder holder. [0080]FIG. 18 is a view showing a cylinder holder equipped with two movable clamps. [0081]FIG. 19 is a view illustrating holding and posit