Door device of elevator

The invention can eliminate position offset and efficiently install a door top box, and can install the door top box even under the condition that the working space is small. According to one embodiment, the door device is provided with: a bracket (22) for fixing a door header box (14) to the wall surface of an entrance/exit; and at least two or more sets of fastening members for fixing the door top box to the bracket. At least two or more parallel first long holes (24) are formed in one of the upper end portion of the door top box and a mounting portion (26) of the bracket overlapping the upper end portion, and second long holes (27) orthogonal to the first long holes are formed in the other of the upper end portion of the door top box and the mounting portion (26) of the bracket. The fastening members are inserted through the first long holes and the second long holes to be fastened, and at least one set of the fastening members constitute a directional fixing portion that fixes the door top box such that o