1. A bead filler inspection apparatus comprising: an imaging section that captures an image of a join portion of a bead filler formed by being wound onto a rotating support body and joined, and a region containing a boundary between an outer edge of the bead filler and the support body; an edge detection section that detects an edge corresponding to the boundary between the outer edge of the bead filler and the support body based on an image obtained by the imaging section; a computation section that computes distances between a reference model line, that runs along the rotation direction of the support body and is determined based on an edge detected by the edge detection section, and each respective point on the edge present in a region containing the join portion; and a determination section that performs good/no-good determination on the join portion based on the distances.