To improve acoustic characteristics without increasing the manufacturing cost or increasing the size. Provided are a drive unit and a vibration plate unit. The drive unit includes a yoke formed by a magnetic material, magnets attached to the yoke, a coil to which a drive current is supplied, and an armature provided with a vibration portion that vibrates when the drive current is supplied to the coil. The vibration plate unit includes a holding frame including an opening, a film covering the opening and pasted on the holding frame, a vibration plate pasted on the film and held inside of the holding frame, and a transmission beam that transmits vibration of the vibration portion to the vibration plate. An entire circumference of an outer circumference of the vibration plate is isolated from an entire circumference of an inner circumference of the holding frame.