To provide a plane speaker in which a single speaker unit is mounted in a cabinet to attempt to achieve reproduction with fidelity.

The present invention relates to a plane speaker in which a part of or all the sound absorptive flexible film mounted around the full circumference of an end face of a diaphragm is covered with a sound absorptive flexible film similar to the sound absorptive flexible film, a part of or all a sound absorptive flexible film mounted around the full circumference of the end face of the diaphragm is covered with a sound absorptive flexible film similar to the flexible film in such a way that and a part of or all the sound absorptive flexible films mounted on the end face of the diaphragm is covered from a side opposite to the side where a driving coil is provided, of the diaphragm, namely, from the front side, and mounted on a frame of the speaker. Two sets of sound absorptive flexible films mounted on the frame of the speaker support the diaphragm by holding the sound absorptive flexible film mounted around the full circumference of the end face of the diaphragm from both front and rear sides.