Problem to be solved: to provide an ultra-thin type writing / posting board which is simple in the form of an ultra-thin type, excellent in appearance and is difficult to fall, and is capable of simplifying the processing of a chalk or the like which is a waste disposal.The ultrathin writing and posting board 1 according to the present invention isThe surface material 3 is made of iron or the like.Coating is doneThe back side is formed of a base material 4 such as wood.Between the surface of the surface and the back sideA board body 2 having three layered layers formed in a three layered structure with a thin plate-like sheet material made of magnet material or the like interposed therebetween and a rectangular layerA frame member 6, which is mounted on the outer periphery of the main body of the main body and surrounds the upper and lower sides of the outer periphery7 andA powder receiver 8 placed on the bottom of the main body of the main body, such as a choke or an iridiumBoth sides of the powder receiver are openable and closed in the length direction.A choke that is collected in the powder receiver and discharged to both cornersHaving a dust receiving box 9 for storing waste debrisThe thickness of the board body of a three-layer structure is formed to a very thin thickness of 5 mm to 10 mm or less.Diagram
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