The stand base is for a surgical microscope. The stand base is for setting up on a floor configured as a planar surface and includes at least a first weight module; a base body defining an underside and accommodating the first weight module; a support arrangement connected to the base body and supporting the stand base with at least three support points in contact engagement with the floor to permit setting up the stand base; the support points conjointly defining a support plane whereat the support points are in contact engagement with the floor; the underside of the base body facing toward the support plane; an ancillary body; the base body having a receiving arrangement in the underside for releasably accommodating the ancillary body; and, the underside of the base body and the support plane conjointly defining a smallest spacing therebetween which is greater than 10 cm.