PURPOSE: To provide a concrete structure in which the projection of a grounding conductor is eliminated and the raising curing of a floor is made unnecessary at the time of carry-in/out of apparatus.

CONSTITUTION: A metal case 25 is leveled so as not to project from the surface, welded to a bar arrangement 9, then embedded in a concrete building frame 4. An embedding side ground terminal 20 is fixed to the metal case 25 with a case fixing nut 24. An embedding side grounding conductor 19 connected to a main mesh arranged in a lower ground of the concrete base body 4 is fixed to a compression terminal 22 of the embedding side ground terminal 20. After an apparatus is installed in a concrete structure, a terminal of a standing-up side grounding conductor connected to the apparatus is screwed to a bolt part 23 of the embedding side ground terminal 20 to ground the apparatus.