PURPOSE: To simplify a structure by a method wherein a hinge arm is moved to the outside through a tension member along a long hole, and a direction is changed by revolving a door.

CONSTITUTION: A hinge arm 3 is movable in a mounting case 5, fixed in the case 2, along oblong holes 8 and 9. A tension member 10 is guided through the control curve of a bent arm 13 formed in an arch shape and the terminal end thereof is fixed in a position 12 of the floor of the case 5 through a roller 15 in the arm 3. When a door 1 is migrated from a closed state to an opening state, the tension member 10 is stretched and lengthened when the door 1 is changed into an out state. The tension member 10 is released through the control curve, the arm 3 is pulled out in an up state in the direction of an arrow mark 17, and push-out movement to a fixed side wall 18 is achieved. Further, bolts 6 and 6, simultaneously, are moved within oblong holes 8 and 9. This constitution simplifies a transmission mechanism and reduces a cost, and improves durability.