To provide a small electric power type door lock system capable of reducing the power consumption in being used and reducing the cost of installation of a system.

This small electric power type door lock system is provided with a reading circuit part of an information card, a determination circuit part determining correctness of the information card, a control circuit part for controlling the locking/unlocking, a lock mechanism part operated by a signal from the control circuit part, being a component of the mechanical lock, and retaining the operation of a lock member provided for mechanically locking the lock into a movable or a locked state, and a power supply part for feeding the power to the respective circuit parts and the mechanism part in a mechanical type lock.