The present invention relates to a seat margin display device of the bus, and in particular, is installed on the inside of the seat (2) load detection sensor 10 for detecting the occupant of the occupant; An electronic control unit 20 connected to the output terminal of the load sensor 10 and the door opening / closing switch 1 to receive their output signals and to compare / determine the pre-stored data to output control signals; Is connected to the output terminal of the electronic control unit 20 and is installed on the top of the doorway (3) of the vehicle consists of an electronic sign to inform the driver and the passengers the number of seats in accordance with the output signal of the electronic control unit 20, By displaying the spare seats through the electronic board, passengers who ride in the vehicle may view the spare seats and determine whether to ride, thereby providing convenience to the passengers.
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