Provided is a hook which is capable of holding multiple objects or an object having a large size of width by efficiently using a space inside the hook, reliably preventing the hanged object from dropping, and allowing the hanged object to be taken out easily.A hook body has a latch that locks an arm biased toward an outside of the hook body by an arm biasing mechanism, and regulates a displacement of the arm, thereby closing an opening portion. While the latch is biased by a latch biasing mechanism so as to face the opening portion and be present at an arm regulating position for locking the arm, the latch is displaced from the arm regulating position against a biasing force of the latch biasing mechanism so as to unlock the arm.