PURPOSE: A display part of air conditioner is provided to display operational condition of the air conditioner. CONSTITUTION: A display board(60) includes a housing(61) coupled to a rear side of a base panel(50); a light transmitting device(63) placed on a printed circuit board(62) mounted in the housing and installed to the rear side of the base panel to transmit light; a light emitting part(64) installed on the light transmitting device and exposed to a front side of the base panel to emit light to the outside; a light source(80) installed on the printed circuit board correspondingly with both ends of the light transmitting device; and a light guiding device(70) installed on the printed circuit board to guide light emitted by the light source to the light transmitting device.
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