The inventive safety belt retractor and safety belt device including the safety belt retractor can effectually prevent end-locking caused by pulling out a sensor via the safety belt, and can form a structure preventing the end-locking with a smaller and compacter configuration. When an eccentric gear (14) rotates along with retraction or pull-out of the safety belt, a pair of stop components (45, 46) are controlled by a cam slot (49) provided on a casing (10), guide slots (47, 48) of the eccentric gear (14) along an ELR-ALR switching mechanism is movable in a diameter direction of a reel. At the time of approximately totally retracting the safety belt, the stop components (45, 46) are located in large-diameter side arc slots (49c, 49d), thus pressing inner circumference of a ring section (12b) to prevent swing of inertia wheels (12). Besides, in case of pulling out the completely-retracted safety belt by a prescribed amount, the stop components (45, 46) are located in small-diameter side arc slots (49a, 49b), thus not pressing the inner circumference of the ring section (12b) to enable free swing of the inertia wheels (12).