PURPOSE: To generate parallel movement when an inner door is opened and closed and provide it with adjustability into any desired opening/closing angle by constructing the object device from a resilient piece to be detained with an inner and an outer door, a cable in linkage with either a top plate or bottom plate and the inner door, and a restraining member.

CONSTITUTION: With rotation of the rotary shaft 4 of a door construction 2 generated by a driving means 5, engagement of the inner door 2e connecting wire 11 with a parasitic member 14 is raised gradually, so that its tension goes out gradually to permit a resilient piece 9 to press the inner door as the free end in a magnitude corresponding to the decrease in the tension, which causes gradual rotation in the direction of bending around a hinge 3 with progress of the door opening, so that the inner door mounting angle is corrected to accomplish parallel holding relative to the household Buddhist altar at all times. Because a cable is detained again with a restraining member when the door construction is rotated outward by the abovementioned driving means 5, the wire 11 is tightened, and one end face of the inner door is pulled against the action of the resilient piece to generate outward rotation round the hinge, so that the front opening of teh Buddhist altar will be opened fully while the door construciton is moving to its rotation limit.