Spinning reel

A spinning reel, comprising

• a reel body;
• a spool shaft movably supported to the reel body in a forward-backward direction reciprocally;
• a spool connecting to the spool shaft and having a bobbin trunk which a fishing line is capable of being wound on thereof and a front flange radially, extending outward from a front end of the bobbin trunk;
• a spool ring disposed on a radial outward side of the front flange;
• and
• a drag knob configured to adjust a drag force against the spool and disposed in front of the spool shaft,
• wherein a spherical boundary defined to contact an external radial portion of the spool ring,
• a tangent line defined to tangent to the spherical boundary at a contact point of the external radial portion and the spherical boundary as seen from the radially outside of the spool ring,
• an angle between the tangent line and a straight line that is orthogonal to the spool shaft, is less than or equal to 45 degrees, and
• the drag knob disposed inside of the spherical boundary.