PURPOSE: To provide the mounting structure in which a face grating is difficult to be removed from the outdoor side, which has a high burglarproof effect, in which the face grating is easy to be mounted and dismantled from the indoor side and which has excellent maintenance properties,

CONSTITUTION: In a structure in which a face grating 20 is mounted on a sash frame 1 installed into the opening section of the wall of a building, the upper frame 21 and lower frame 22 of the face grating 20, in which an insect screen 26 is unified on the indoor side, are arranged on the outdoor sides of wire screen rails!4, 7 formed to the upper frame 2 and lower frame 3 of the sash frame 1. Fixtures 50 forming upward and downward grooves 55 respectively by screwing onto side faces on the indoor side of the upper frame 21 and lower frame 22 of the face grating 20 are set up onto the side faces on the indoor side of the upper frame 21 and the lower frame 22 by screws 31 under the state in which the wire screens 4, 7 of the sash frame 1 are housed in each groove respectively.