To provide an automatic opening-closing device, easily and surely installable on any windows regardless of new and existing windows, and automatically blocking-up/opening and/or locking/unlocking the window by a remote controller and/or a sensor.

This automatic window opening-closing device is composed of a frame body 2 erected between window outer frames 100 and attached and connected to one window inner frame 101, a locking-unlocking mechanism of locking and unlocking a liftable window arranged in a frame body 2 and/or the one window inner frame 101, a lock member arranged in the other window inner frame 102 locked with a claw of the locking-unlocking mechanism, a window opening-closing automatic opening-closing mechanism formed of a motor and a driving body arranged in the frame body 2 and a slide preventive member arranged in the other window inner frame 102, a wind speed sensor 40, a moisture sensor 41, an alarm unit D issuing an alarm when a vibration sensor C is started, and a control part B controlling the locking-unlocking mechanism and the automatic opening-closing mechanism.