A seat including: a seat surface portion having first and second support surfaces； and a switching mechanism, wherein the seat surface portion is switched by the switching mechanism between: a first posture in which the seat surface portion is brought down to the front side such that the first support surface is in a low position where a seated person is capable of sitting thereon by lowering a hip, and a second posture in which the seat surface portion is brought up to the rear side from the first posture such that the second support surface is in a high position where the seated person in a standing posture is capable of sitting thereon, and wherein a vibration device which is configured to apply vibration corresponding to music to a body of the seated person is disposed at an inner side of the second support surface.
