Objecting positioning/fixing device

An object positioning/fixing device which accomplishes horizontal and vertical positioning and fixing of a target object on a base member, wherein:

• the base member comprises, a first reference member for horizontal positioning, a second reference member for regulating rotation around the first reference member in a horizontal plane and disposed in a position isolated from the first reference member, and a reference seat for vertical positioning,
• and wherein;
• the first and second reference members respectively comprise, a flange portion, and an engagement convex portion protruding upwardly from a center of the flange portion, said engagement convex portion of the first and second reference members respectively comprising a first and second tapered engagement surface whose diameter decreases upwardly,
• and wherein;
• the target object comprises multiple annular engagement members having respectively an annular engagement portion capable of deforming elastically so as to increase respective outer diameter and capable of respectively engaging tightly with the first and second tapered engagement surfaces of the first and second reference members,
• and wherein;
• said object positioning/fixing device is constituted so that, by mounting the target object on the reference seat of the base member, fastening multiple clamp bolts to multiple bolt holes on the base member side from multiple bolt pass through holes formed in the target object, and pressing the target object to the reference seat, the target object is positioned and fixed through an elastic deformation of the annular engagement portions.