To provide a door which characteristically allows a hand to be passed through a hole from outside so as to enable the operation of an inside key when going out by providing the door with the hole having such high crime- prevention properties as to make it impossible for an outsider to conduct the operation of the inside key though an insider can easily conduct the operation thereof.

A screen 4a, a guiding instrument 5a and a guiding instrument 5b with a screen 4b are installed inside the hole formed in the door 1, and the mechanical inside key 6a and the electronic inside keys 6b and 6c are mounted in arbitrary positions.