To provide a fixing tool that can secure relative positioning of the members precisely and reliably in the assembly of a plurality of magnetic poles to a support structure.

This is a fixing tool for assembling a plurality of members to a support structure and comprises a body (10, 12) for defining a space that is structured to accommodate the support structure and a plurality of members, an arm that is fitted on the outside structure (12) so as to be capable of moving in the pushing direction of the member and engages with the corresponding outside end portion of the plurality of members in such movement, a means driven by gravity (weight C) that engages the arm with the plural members by energizing in the pushing direction of the member and thereby pushes the plural members onto the engaging position for the support structure.