The present design relates to the safety key to the key day withdrawal method used in the locking device of the object library for storing personal items in public facilities such as saunas, a swimming pool or gym. Security key of the subject innovation is, has a ring (6) is a band (4) is connected to be able to be worn on the body, such as a tooth on one side in the longitudinal direction of the uneven surface (3) is the key day of storage space that is formed casing (2a) is provided (2); Some day is the key storage area with a status handle (8) that can move in the longitudinal direction of the space in the housing (2a); Obtain perfected external force is applied in the moving direction for supporting the elastic retaining body and the uneven surface (3) of the handle (8) so that the tab (8) can be moved elastically; In a combined state with the handle 8 and the concave-convex type the key by day luggage into the storage space (2a), the key flow with the handle (8) and that is selectively drawn out from the key day storage space (2a) day in that it comprises 10 to be characterized by using a more convenient and safe.
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