PURPOSE: To array and arrange external connection lead terminals and to automate the mounting on a circuit board by providing an engagement projection part for positioning on the external wall of the cap part of a case and also forming spacers at the same positions on the top surface of the cap part and the bottom surface of a base part.

CONSTITUTION: The engagement projection part 8 for positioning is provided on the external wall of the cap part 4 of the case (a) and an insertion hole 9 where the tip part of an external connecting lead terminal 1 can be inserted is formed in the top surface of the cap part 4 of the case (a); and the spacers 10 and 11 are formed at the same positions on the top surface of the cap part 4 and the bottom surface of the base part 3. Therefore, while the engagement projection part 8 is fitted in a housing recess part, the buzzers are housed in order and their position are controlled; when the piezoelectric buzzers are laminated, the spacers 10 and 11 abut on each other to control the interval of the piezoelectric buzzers. Consequently, the lead-out directions of the external connecting lead terminals 1 are put in order and the mounting on the circuit board is automated.