A locking device includes a locking mechanism and a striker. The locking mechanism includes a lock base, a hook and a pawl. The lock base has a recess that is capable of receiving the striker. The hook is capable of forming a locked condition in which the striker is held between the hook and the recess of the lock base or an unlocked condition in which the hook is spaced away from the striker. The pawl is capable of rotating to a position in which the pawl can engage an engagement surface of the hook and maintaining the hook in the locked condition. The engagement surface of the hook is provided with a resin coating that constitutes an elastically reactive portion. The elastically reactive portion is shaped to produce an elastically reactive force between the engagement surface of the hook and the pawl in the locked condition.