Abstract: A mechanism for guiding a shuttle in a circular loom having shuttles provided with a plurality of rotatable supporting wheels moved along a circular running passage. Wefts taken out from each shuttle are inserted into successive sheds of warps created immediately before the arrival of the shuttle and are interwoven with the warps to form a tubular fabric. The circular running passage is defined by at least one annular guide surface created by an element guide surface of each reed element of an annular reed member of the circular loom. The running passage of each of the supporting wheels is restricted by a corresponding one of the annular guide surfaces located at a corresponsing position. Possible pressing of the warps against the upper and lower annular edge portions of the annular reed member by the supporting wheels is prevented.