Coil assembling device, coil assembling method, and rotating electric machine manufacturing device

Provided is a coil assembling device, a coil assembling method, and a rotating electric machine manufacturing device capable of quickly and efficiently assembling a coil from a plurality of coil segments and capable of easily and quickly assembling a coil comprising a multilayer coil segment. The coil assembling device is provided with: a conveying means for sequentially conveying a plurality of coil segments each comprising a pair of slot insertion portions extending substantially in parallel with each other and a jumper portion connecting the pair of slot insertion portions; a segment arranging body having a plurality of segment holding portions arranged in a circular ring shape along the circumferential direction and capable of rotating about the central axis, the segment holding portions enabling the respective plurality of coil segments conveyed by the conveying means to be inserted thereinto from the outside in a radial direction; and a guide means is configured so that: one of the pair of slot insertio