To prevent accidents such as disappearance due to demented elder's accidentally riding on an elevator in advance by making the demented elder not push a riding button in nursing homes such as geriatric health service facilities and old-age homes for the demented elder.

A cover with an opened hole 1 with dimension not to pass a little finger is attached to an elevator riding button to cover the riding button with a cover, so that a direct operation of the button with fingers is prevented. Instead, a key of an automobile and the like, and a tip of an ear hook portion of spectacles is inserted in the hole 1, so as to bush the riding button.