To provide a hooked ball fastener which can easily impose a locking spring despite its ability to bring out a sufficient twisting elasticity.

The invention is composed of a ball fastener 1, a hook 2, a locking spring 4, and a bracket 25 which supports the locking spring 4. The locking spring 4 is provided with a pair of locking arms 33 placed on right and left sides connected with each other in a U form and a pair of installing arms 34, 35 in short and long lengths, respectively, which is connected with both locking arms 33. A first assembly hole 28 which supports the long installing arm 34 and a second assembly hole 29 which supports the short installing arm 35 are formed out of alignment with each other on the bracket 25. A runout concave section 30 which accepts the short installing arm 35 is formed near the second assembly hole 29 to reduce the distance which the installing arm 35 needs to travel when locking the short installing arm 35 on the second assembly hole 29.