Seat belt retractor and seat belt apparatus

A seat belt retractor comprising:

• a spool that retracts a webbing that restrains an occupant;
• a base frame that accommodates the spool while allowing the spool to rotate;
• and a lock mechanism that regulates rotation of the spool,
• wherein the lock mechanism includes a locking base disposed at an end portion of the spool, an opening which is formed in the base frame and through which the locking base is inserted, engagement teeth formed at an inner edge of the opening, and a pawl that is disposed outwardly movable in a radial direction relative to the locking base and that is engageable with the engagement teeth,
• wherein the lock mechanism further includes a protect cover that includes a side wall portion disposed so as to cover a side portion of the locking base which faces to the engagement teeth a portion of the protect cover is inserted through the opening of the base frame, and,
• wherein, the protect cover is a separate member from the locking base and protects the side portion of the locking base so as not to contact with the engagement teeth of the base frame when the spool is moved with respect to the base frame and decentered;
• and wherein the protect cover includes a ceiling portion disposed on a surface of the locking base, and wherein the side wall portion is formed along an outer circumference of the ceiling portion.