To provide an earth-pressure gauge fixture for a shield machine, in which the pressure-receiving surface of an earth-pressure gauge for the shield machine can be protected from the earth pressure and impact force of soil and sand in a cutter chamber, by which the earth-pressure gauge can be replaced easily and safely from the machine inside and in which damage is prevented in spite of simple constitution and the frequency of replacing works is reduced.

The installation of a masking plate 32 between the pressure- receiving surface of an earth-pressure gauge 5 and soil and sand S as well as the interposition of an elastic body 33 between the masking plate 32 and the pressure-receiving surface and the mutual-fast sticking of these masking plate, pressure-receiving surface and elastic body are aimed at. An earth-pressure mounting seat 8 mounting the earth-pressure gauge 5 on a chamber partition wall 3, the elastic body 33 set up on the cutter chamber 4 side while being brought into contact with the pressure-receiving surface 11 of the earth-pressure gauge 5 and the masking plate 32 brought into contact with the elastic body 33 while being brought into contact with soil and sand S in the cutter chamber 4 are fitted at that time.