A HANDLE ARM MOUNTING STRUCTURE (9) FOR A SPINNING REEL INCLUDES A FASTENING SECTION (25A) AND A WASHER MEMBER (27). THE FIXING SECTION HAS A FIRST NON-CIRCULAR HOLE (25C) CONFIGURED TO ENGAGE NON-ROTATABLY WITH A NON-CIRCULAR SECTION OF A HANDLE SHAFT. THE WASHER MEMBER HAS A CIRCULAR DISK-LIKE SECTION (27A) AND AN ENGAGING PROTRUSION (27B) AND IS CONFIGURED TO BE MOUNTED IN AN AXIAL DIRECTION OF THE HANDLE SHAFT. THE CIRCULAR DISK-LIKE SECTION HAS A SECOND NON-CIRCULAR HOLE (27C) CONFIGURED TO ENGAGE WITH THE NON-CIRCULAR SECTION. THE ENGAGING PROTRUSION IS ARRANGED TO PROTRUDE TOWARD THE FIRST NON-CIRCULAR HOLE FROM A PERIPHERY OF THE SECOND NON-CIRCULAR HOLE. THE ENGAGING PROTRUSION HAS AN INSIDE SURFACE (27D) CONFIGURED TO ENGAGE WITH THE NON-CIRCULAR SECTION AND AN OUTSIDE SURFACE (27E) HAVING A FIRST TAPERED SURFACE (27F) CONFIGURED TO TAPER TOWARD A TIP END AND TO ENGAGE WITH THE FIRST NON-CIRCULAR HOLE. FIG. 4
