To provide an instrument for improving a safety operation by preventing a disturbance of a ventilation of anti-fogging of a document placed on a dashboard, by forming a space on a blowing port for the ventilation on a rear surface of a front glass or the dashboard of a vehicle.

A document receiver made of a lattice a frame is divided into three sections of a front section (1), an intermediate section (2) and a rear section (3). These sections are connected by vertically freely moving joints C (12). A spring (5) and a document retainer (4) are mounted at the section (1) bent in an L shape by joints B (11). A suction board supporting arm (8) is mounted at a joint A (10). A suction board (7) is mounted at a distal end of the arm (8).