To improve a security function of a house by notifying a predetermined contact destination of an unlocked state of an electronic lock when there is no person in the house by using the unlocking detected result of a human sensor and a lock sensor for the electronic lock for monitoring presence of a person in the house when a user occasionally goes outside without locking a front door carelessly.

In the telephone device with the security function composed of a telephone set 2 for receiving a warning signal from a monitoring sensor 1 and notifying the notification destination stored in advance of the warning signal and an alarm 3 for reporting an abnormal state, When a human sensor 5 for monitoring presence of a person in the room detects absence for a predetermined time and a lock sensor 6 of an electronic lock 7 provided in the entrance/exit detects unlocking, the alarm 3 notifies the notification destination of "unlocking" via the telephone set 2.