The coil assembling apparatus includes a transport means for transporting in sequence a plurality of coil segments, each of the plurality of coil segments consisting of a pair of slot insertion portions and a linking portion for coupling the pair of slot insertion portions, a segment arrangement body capable of rotating around a center axis thereof and provided with a plurality of segment hold portions annularly arranged along a circumferential direction of the segment arrangement body, into which the plurality of coil segments transported by the transport means can be respectively inserted from an outer radial directions of the segment arrangement body, and a guide means for guiding to insert one slot insertion portion of the pair of slot insertion portions of each of the coil segments into one of the segment hold portions each time the segment arrangement body rotates by a first predetermined angle.