A shielding structure of thin type monitor device, includes: a monitor body; a first shielding box which is arranged in the monitor body, which is formed by cutting and bending a metal plate, which includes a flat plate portion having rectangular shape, and a terminal supporting portion which is formed by bending one end portion of the flat plate portion, into which a terminal is passed through, and which is fixed on a metal plate in the monitor body that is grounded; a terminal holder which includes a terminal hole which contacts with an opposite side of the terminal supporting portion with respect to the flat plate portion, through which the terminal is passed, and which forms a part of case of the monitor body; and a second shielding box which is formed by cutting and bending a metal plate, which includes a protecting portion that has a rectangular shape, that is arranged such that it contacts with the terminal supporting portion and that is made be parallel with the flat plate portion, and a standing portion which is formed by bending three sides in the protecting portion that do not contact with the terminal supporting portion and which is made contact with the flat plate portion.