Inner door lock

The utility model relates to an inner door lock. A lock tongue plate and a shifting wheel of the existing inner door lock are generally connected through gears when the tongue is locked under external force, the gears can be rotated to open the inner door without ideal anti-prizing effect. The utility model comprises a lock casing, a face plate, a lock tongue with blind holes, a lock tongue with through holes, an inclined movable tongue, etc. The utility model is characterized in that the lock tongue plate is connected with the shifting wheel through a connecting rod which can connect the lock tongue plate and the shifting wheel; when the inner door lock is tightly locked, the connecting rod is vertical to the lock tongue plate; the connecting point of the connecting rod on the lock tongue plate and the shifting wheel is arranged at a straight line with the center of a handle knob to form a stopping point; when the tongue is locked under the external force, the connecting rod can not rotate. The inner door lock has the advantage of good anti-prizing effect.