PURPOSE: To compactly support unspecified plural number of external microphones by providing a microphone arrangement part including plural receiver holes containing the stoppers.

CONSTITUTION: A baffle plate 7 containing speaker 2 is attached to a jaw 10 provided on the inner circumference of a cabinet 1. Meanwhile a bottom plate 8 including the vent holes 9 is attached to a jaw 11 provided also on the inner circumference of the cabinet 1. A microphone arrangement part 5 including plural receiver holes 4 which have the grid-shaped toppers 3 at the lower end of each hole 4 is set at the upper part of the cabinet 1. Then the external microphones are put into the holes 4 with the head part of each microphone turned down and supported by the stoppers 3. Therefore these external microphones can surely catch the sounds given through the speaker 2 in a batch.