PROBLEM TO BE SOLVED: To provide a wiring/piping box which can be easily and quickly arranged onto a fixed part.SOLUTION: A wiring/piping box 110, which has an opening 112 on a front surface of a peripheral wall 111 constituted of a bottom wall 111a and a side wall 111b, is fixed with a screw 150 to a fixed part of a building through a fixing part formed on the peripheral wall 111. The fixing part comprises: a fixing hole 113 which is formed into a size sufficient for a screw shaft part 152 to pass through and insufficient for a screw head part 151 to pass; a through hole 114 that is communicated with the fixing hole 113 and formed into a size insufficient for the screw head part 151 to pass through; and a blocking piece 115 formed to be able to open and close the through hole 114. By passing the screw head part 151, fixed protrudingly to the fixed part, from the through hole 114 to the inside of the box, relatively moving the screw shaft part 152 into the fixing hole 113 and blocking the through hole 114 with the blocking piece 115, the wiring/piping box 110 can be supported onto the fixed part.
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