Spindle structure for a pedal

A pedal comprising:

• a pedal body having a through hole formed from one end thereof to another end thereof, two ends of the through hole respectively defined as a first end opening and a second end opening;
• a sleeve formed with a flange disposed at the second end opening of the pedal body;
• a ring disposed at the second end opening of the pedal body and proximate to the flange of the sleeve;
• and
• a spindle body formed in one piece and assembled on the pedal body, the spindle body having an insert portion and a threaded portion respectively defined at two ends thereof, the insert portion inserted into the through hole of the pedal body and passing through the sleeve and the ring, a tip portion of the insert portion defined as a positioning portion and extending outside the ring, a periphery of the positioning portion sloped and widened toward the ring and resting upon the ring so as to retain the spindle body in position, the threaded portion exposed from the first end opening, and the positioning portion exposed from the second end opening.