Abstract: A seat belt anchor for detachably mounting a seat belt on a bolt has a shank extending axially from a vehicle body panel and a bolt head projecting in a radial direction from the shank. The seat belt anchor has an anchor plate with a keyhole shaped slot including an access portion for receiving the bolt head and a retaining portion which is narrower than the bolt head and further from the seat belt than the access portion for receiving the shank of the belt. The anchor plate is mounted on the bolt when the retaining portion of the keyhole shaped slot is registered with the bolt head. An axially yieldable spring carried by the anchor plate axially engages the bolt head to urge the anchor plate into engagement with the bolt head. A spring and a pair of detent bosses carried by the anchor plate engage with the bolt head to retain the anchor plate radially holding the bolt in the retaining portion of the key hole slot.