Abstract: A spinning rod retainer cap fits over the mouth of a tubular rod holder to hold the handle and reel of a spinning rod inserted therein. The retainer cap comprises a cylindrical skirt, and a plurality of resilient fingers extending inwardly from the upper end of the skirt, the tips of the fingers defining an entry opening for the handle into the tubular rod holder. Two retainer posts extend upwardly from the skirt adjacent resilient fingers and are spaced apart to define a notch receiving and accommodating the mounting strut of the reel. The resilient fingers incline toward the rod handle to form the notch into a triangular configuration with a narrow entry slot for receiving and restraining the reel strut of the reel.