POSITION HOLDING MECHANISM AND IMAGE FORMING APPARATUS

To prevent falling from a holding position.SOLUTION: A position holding mechanism comprises: a connection member 10 that is provided on any one of an outer door and an inner door and includes a slide hole 12; and a connection boss 4 that is provided on the other of the outer door and the inner door and is connected to the slide hole 12 to slide the slide hole 12 in association with rotation of the inner door with respect to the outer door. The slide hole 12 has, in communication with each other, a first wide part 12a, a second wide part 12c and a third wide part 12f in which the length in a width direction W orthogonal to a slide direction D2 in which the connection boss 4 slides is equal to or longer than the length d1 in the width direction W of the connection boss 4, a first narrow part 12b that is provided between the first wide part 12a and the second wide part 12c and is less than the length in the width direction W of the connection boss 4, and a second narrow part 12d that is provided between the second wide part 12c and the third wide part 12f and is less than the length in the width direction W of the connection boss 4.SELECTED DRAWING: Figure 6 【課題】保持した位置からの落下を抑制する。【解決手段】外扉及び内扉のいずれか一方に設けられ、スライド孔１２を備えた連結部材１０と、外扉及び内扉のいずれか他方に設けられ、外扉に対して内扉が回動するのに伴ってスライド孔１２を摺動するように、スライド孔１２に連結された連結ボス４と、を備える。スライド孔１２は、連結ボス４が摺動する摺動方向Ｄ２と直交する幅方向Ｗの長さが、連結ボス４の幅方向Ｗの長さｄ１以上である第１幅広部１２ａと第２幅広部１２ｃと第３幅広部１２ｆと、第１幅広部１２ａと第２幅広部１２ｃとの間に設けられ連結ボス４の幅方向Ｗの長さ未満である第１幅狭部１２ｂと、第２幅広部１２ｃと第３幅広部１２ｆとの間に設けられ連結ボス４の幅方向Ｗの長さ未満である第２幅狭部１２ｄと、を連通させて有する。【選択図】図６