SEAT BELT RETRACTOR AND SEAT BELT APPARATUS

In order to provide a seat belt retractor and a seat belt apparatus in which contact between a locking base and a base frame can be suppressed, a seat belt retractor includes a spool (2) that retracts a webbing restraining an occupant, a base frame (3) that accommodates the spool (2) while allowing the spool (2) to rotate, and a lock mechanism (4) regulating rotation of the spool (2). The lock mechanism (4) includes a locking base (41) disposed at an end portion of the spool (2), an opening (31) that is formed in the base frame (3) and allows the locking base (41) to be inserted therethrough, engagement teeth (32) formed at an inner edge of the opening (31), and a pawl (42) that is disposed radially outwardly movable relative to the locking base (41) and engageable with the engagement teeth (32). The lock mechanism (4) further includes a protect cover (43) that is attached to the locking base (41) and includes a side wall portion (43b) disposed along a side surface portion of the locking base (41).