To provide a cabinet for medical dental diagnosis which has a simple construction to support the weight on one pillar because a conventional cabinet for medical dental diagnosis supports the weight on its construction elements to require a thick, big and stout material and a strong and complicated construct, resulting in the difficulty in cost reduction, the narrow inside and opening of a holder, and many limitations in design.

The cabinet for medical dental diagnosis comprises a pillar, a back board, a thin-long table, a reception box, an arm, a display panel, and a multi-joint arm, wherein the pillar is set to stand on a floor; the back board is fixed to and supported by the back surface of the pillar; the thin-long table projects itself horizontally frontward across the width of the back board along the half way of the back board; the reception box is set to the back board under the thin-long table to project itself frontward; the arm is rotatably mounted to the pillar upward from the thin-long table; the display panel is mounted to the top end of the arm; and the multi-joint arm has a top end and a basement, the top end mounting an instrument table and the basement being mounted to a bottom board.