To perform the prompt inspection of the external shape of a green sheet before the progress of its hardening in curing in the inspection of the green sheet at the inspection of the green sheet in the manufacturing line of an inorganic molding body and, after its inspection, the green sheet is recycled as a cement base molding material.

This inspecting device comprises a tray conveying device 4 for taking an arbitrary tray 2 out of a carrier conveyor 3 for carrying trays 2 with each green sheet 1 seated thereon, an inspection stage 5 for inspecting the green sheet 1 seated on the tray 2 supplied by means of the tray conveying device 4, a tray returning conveyor 6 for carrying the tray 2 after the inspection supplied from the tray conveying device 4 and a material returning conveyor 7 for carrying the green sheet 1, which is fed from the green sheet 1 seated on the tray 2 in the middle of carrier on the tray returning conveyor 6. In addition, the tray returning conveyor 6 is provided with a material conveying device 8 for slidingly conveying the green sheet 1 seated on the tray 2 from the tray 2 to the material returning conveyor 7 by tilting the tray 2.