plate 18 and on the back surface of the steel wall plate 13 and the anchor members are not projected over the surface of each steel plate 18 13 thus the present embodiment can easily install the internal structures that must be installed on at least two of the sidewall members 31 the floor member 32 and the ceiling member 33 specifically the equipment 19 into the module 30 it is possible to align the through holes into which the mounting bolts 37 are inserted formed in the installation frame 25 with the openings 39 formed in the steel floor plate 18 while moving the lower surface of the installation frame 25 of equipment 19 horizontally along the upper surface of the steel floor plate 18 if the through holes are not aligned with the openings 39 when the lower surface of the frame 25 touches the upper surface of the steel floor plate 18 it is possible to easily align the through holes with the openings 39 by moving equipment 19 horizontally while the lower surface of the frame 25 touches the upper surface of the steel floor plate 18 in this state because it is possible to touch directly a side surface of the installation frame 24 to an inner surface of the steel wall plate 13 the through holes into.