Ironing board consisting of a folding structure which comprises at least one support foot , configured to keep said structure fixed and stable on the floor in an open or operating configuration of the ironing board , and at least one work surface which, in the open or operating configuration of the ironing board , is arranged in a substantially horizontal position, at a predetermined height with respect to the floor, so as to form a support surface on which the garments to be ironed are placed, the work surface being slidably and/or pivotably constrained to said at least one support foot to allow the rotation or the mutual rotational translation of said work surface with respect to said at least one support foot so that the ironing board can pass from the open or operating configuration to a folded configuration and vice versa, the ironing board comprising a safety mechanism operatively connected to said at least one support foot and configured to selectively block the rotation or mutual rotational translation movement of the work surface with respect to said at least one support foot , wherein said at least one support foot consists of a pair of mutually articulated arms in a substantially X-shaped configuration, wherein a first arm is pivotably constrained, at an upper end thereof, to the lower surface of the work surface while the second arm is slidably constrained, at an upper end thereof, to the lower surface of the work surface , and characterised in that the two arms are also mutually hinged around a pin on which the safety mechanism is installed, so that said safety mechanism is able to selectively block the mutual rotation movement of the two arms and consequently, the corresponding rotational translation movement of said two arms with respect to the work surface , wherein the safety mechanism comprises a pair of blocking elements , each of which is irremovably constrained to a respective arm , both blocking elements being provided with respective opposing surfaces which mutually engage by friction to block the mutual rotation of the two arms , wherein both opposing surfaces are provided with mutually meshing teeth to increase the friction force between the two blocking elements , wherein the safety mechanism comprises at least one elastic component interposed between the two blocking elements and configured to keep said blocking elements disengaged when the safety mechanism is not actuated, wherein the safety mechanism comprises a handle , operatively connected to the two blocking elements and configured to selectively bring closer said two blocking elements , counteracting the elastic force of said at least one elastic component , to move the safety mechanism to the blocked position, as well as to distance said two blocking elements , releasing said at least one elastic component to move the safety mechanism to the unlocked position, wherein a stopping means is attached to one of the arms , configured to keep the handle in the blocked position unless a predetermined unlocking force is applied on said handle , so as to prevent the undesired release of said handle , which may cause the accidental unlocking of the safety mechanism . <EOS>