To provide an ID collation structure which is excellent in anticrime performance and facilitates manufacturing of a key, and to provide a door locking/unlocking device.

When the key 200 is inserted into a key insertion port 211 and if an ID of the key 200 conforms to an ID of a vehicle 1, tips 206a of ID pins 206 push protrusions 242 of pins 241 in an arrow C direction. Herein boundaries between lock pins 240 and the pins 241 are all aligned, and therefore fixture between a slider 230 and a sleeve 210 is unfixed, which enables the slider 230 to move in an arrow A direction and to make contact with an L-shaped link 125 by elastic force in the arrow A direction by a spring 220, to thereby press the L-shaped link 125 in an arrow I direction. Subsequently, movement of the L-shaped link 125 in the arrow I direction is transmitted via a link mechanism 250 to a lever 271 which is then moved in an arrow G direction, and therefore a switch 272 controls an unlocking electromagnet 274, based on the movement of the lever in the arrow G direction, to thereby unlock a door 11.