A vehicle seat is provided comprising a seat back frame having right and left side frames, a headrest for supporting a head of a seat occupant, and a back-and-forth movable body provided inside a backrest that is positioned at a rear of the seat occupant, wherein a backward movement of the back-and-forth movable body forwardly moves the headrest to support the head of the seat occupant. A first insulating block is disposed within the housing and has passages for receiving insulated conductors of the power cable. The preprocessed content stream of bits is transmitted upon request from a receiver.