In a vacuum cleaner having a tank chamber, an air suction chamber, an air circulation chamber, and a motor chamber, a speaker is mounted in the air circulation chamber. A plurality of terminals in the motor chamber actuate: low-speed and high-speed modes of a main motor, a dust-scattering motor, a speech synthesis IC, and a music synthesis IC. The terminals and a liquid level switch are connected to a microcomputer in the motor chamber. After a job is finished, a voice from the speaker automatically informs a worker the job is done and goes on to thank and praise the worker. The speaker then plays a tune, thereby giving the worker a sense of satisfaction and freedom that the job is done and encouraging the worker to start the next job.