A linkage member 3 is pivotally supported, through a first shaft 30, by an article 1 having an opening, is supported, through a second shaft 31, by a lid member 2, and includes a latch 32 engageable with a latch receiver 12 disposed in the article 1. The lid member 2 has an engageable end 201 disposed therein so as to be receivable into an engagement hole 34 formed in the linkage member 3 and further has a switching member 20 disposed therein so as to be movable to selectively set the engageable end 201 in an advanced position to place the engageable end in a most deepest position in the linkage member 3 through the engagement hole 34, in a retracted position to take the engageable end out of the engagement hole 34, and in an intermediate position between both of the advanced position and the retract position. When the engageable end 201 of the switching member 20 is set in the advanced position, the engageable end brings the latch 32 out of engagement with the latch receiver 12.