To provide a car-door lock open-close confirmation device, by which the state of the door locking of an automobile can be confirmed without troubling the circumference and which can also be used as the interior.

The car-door lock open-close confirmation device 10 comprises a cylindrical body 12. A high-luminance LED 18 is installed on one end side of the cylindrical body 12. A through-hole 16 is formed on a side face on the other end side of the cylindrical body 12, and a cord connected to the LED 18 is drawn out from the through-hole 16. The cylindrical body 12 is used as the door-lock knob of a door for an automobile, and the cord of the LED 18 is connected to a controller. The controller is joined with a motor driving a door-lock mechanism by a keyless entry, and light-emits the LED 18 in response to the driving of the motor.