ew of a surface-mounting type capacitor according to a second embodiment of this invention and a transversal cross sectional view along a line 3B-3B of FIG. 3A, respectively; FIGS. 4A and 4B are a longitudinal cross sectional view of a surface-mounting type capacitor according to a third embodiment of this invention and a transversal cross sectional view along a line 4B-4B of FIG. 4A, respectively