PURPOSE: To provide a support fixing structure wherein high work efficiency can be provided and fine adjustment of height of a support can be easily performed and the height may not change for a long period of time, without causing a lowering of design.

CONSTITUTION: Arecess 2 is formed on a concrete surface, where a support is to be erected, and an upright bolt 5 with external thread 3 on the outer surface thereof is provided in the recess 2 so as to protrude upwards. A downwardly oriented bolt 6 with external thread 4 arranged oppositely to the thread 3 on the outer surface thereof is mounted to the lower end of the support 1 so as to protrude downwards, and both of the bolts 5, 6 are connected together by a long nut 9, wherein the upper half and lower half of the inner surface thereof have oppositely directed internal threads 7, 8. And stopper nuts 10, 10 are fixed on the opposite sides of the nut 9 and the recess 2 is filled with filling concrete 11.