To prevent danger of a content to fall when an automatic door opens in the case when the content in a door shelf inside of the automatic door is stored in a state of leaning against the automatic door with the conventional automatic door.

This automatic door with a motor as a power source is devised to immediately stop opening door motion (step 46) even when opening door indication is given by comparing a current torque command value and a torque command value required to open an automatic door single body which is previously memorized with each other (step 42) and consequently by judging it as 'when the door is opened, a content is to fall' in the case when the torque command value previously memorized is larger than the current torque command value (step 45).