To solve the problem that at least either a firing tool or a green boy is broken when they are conveyed and mounted.

The loading device is constituted of a horizontally moving part which is freely reciprocatively movable between a conveying line for the firing tool in which mounting plates for inclinedly supporting green bodies are arranged in series and the upper part of a standing conveyer for the green bodies, a vertically moving part which is provided at the front of the horizontally moving part and a green body-supporting and conveying part which is provided at the lower part of the vertically moving part in such a manner that it can move freely in the horizontal direction crossing orthogonally to the horizontally moving part. Further, a couple of side boards whose mutual distance is freely expanded and contracted are provided at the green body-supporting and conveying part, and plural lower part supporting parts 21, 21, etc., 21a, 21a etc., are arranged at the lower part of the inner side face of the couple of the side boards and plural leaning members 22, 22, etc., 22a, 22a, etc., are arranged at the upper part of the inner side face of the couple of the side boards in the width direction of the boards. The green bodies are conveyed in the inclined state while supporting the both side parts of the hip end face of the lower side of each green body from below with each of the lower part supporting parts 21, 21, etc., 21a, 21a, etc., and while allowing the upper part of each green body to lean to each of the leaning members 22, 22, etc., 22a, 22a, etc., and the green bodies are simultaneously or successively transferred and loaded to the firing tool on the way of aslant descending of the side boards.