PURPOSE: To easily deal with changes in floor face height by preassembling necessary landing entrance component parts to one frame so that the parts are unitized, and enabling the frame to be mounted in an elevator shaft wall opening while being adjusted vertically according to changes in height of a building floor.

CONSTITUTION: All of landing entrance component parts, such as a three-way frame 9, doors 12, and a display 13, are preassembled to a frame 20 sized to fit into a landing entrance opening 8A, so that the component parts are unitized. Transversely elongate mounting plates 23, 24 of Z-steel are secured to the upper and lower frame members 20a, 20b of the frame 20, and a pair of upper and lower receiving members 25, 26 are passed through longitudinally elongate holes and tightened to the back of an elevator shaft wall by anchor bolts 27. The mounting plates 23, 24 are tightened to the receiving members 25, 26 by bolts 29. Thus by achieving the tightening while adjusting the bolts 29 and nuts 30, 28 for the anchor bolts 27, the mounting plates 23, 24 can be adjusted vertically, so that even if floor face height is changed during installation, positioning can be achieved easily.