PURPOSE: To automatically operate and stop an acoustic device without troubling an operator, by detecting that a patient is seated on a dental diagnostic apparatus to operate the power supply device of the acoustic device.
CONSTITUTION: A detector 22 detects that a patient is seated on a dental diagnostic apparatus. An operating signal for operating an acoustic device 33 is inputted to a power supply switch 17 on the basis of the output of the detector 22 through an opening and closing switch 21 only during a time when the patient is seated. The power supply device 12 consisting of a sound source part 14, filters 15A, 15B and amplifiers 16A, 16B of the acoustic device 33 can be operated by said operating signal.
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