Abstract: A socket holder is provided, including: a seat, a sleeving member and a locking mechanism. The sleeving member includes a neck portion which is configured to be assembled with a socket. The sleeving member is movably assembled with the seat. The locking mechanism includes at least one first locking portion, at least one second locking portion which is releasably engagable with the at least one first locking portion, and an operational portion which is movable together with the at least one first locking portion. One of the at least one first locking portion and the at least one second locking portion is disposed on the seat and the other is disposed on the sleeving member. The operational portion includes an operational member which is located out of the neck portion and operable from outside of the socket holder.

Abstract: A socket holder is provided, including: a seat, a sleeve member and a restricting mechanism. The sleeve member is movably assembled with the seat. The restricting mechanism includes at least one first restricting portion and at least one second restricting portion which is movable relative to and engaged with the at least one first restricting portion. When the seat and the sleeve member move relative to each other in an axial direction, the second restricting portion unidirectionally moves along a cycling path relative to the first restricting portion, and the at least one second restricting portion is restricted in a releasing position or a locking position. A socket rack including at least one of the socket holder described above is further provided and further includes: a sliding rail on which the at least one socket holder is slidably disposed.