An earring includes an earring body, a locking bar provided at one end of the earring body and formed with a locking groove, and a locker provided at the other end of the earring body to be selectively locked with the locking bar. The locker is formed with an insert groove, the insert groove is provided at an inside thereof with a locking protrusion, and a locking release button is positioned adjacent to the locking protrusion while protruding out of the locker. The spring includes a compression spring and the locking protrusion is adapted to lock with the locking groove of the locking bar while performing a straight movement in a state in which the locking protrusion is elastically supported to the spring. The locking/unlocking operations of the coupling parts are easily performed and an aesthetic appearance of the earring is improved.