To provide a robot antitheft system having excellent usability and working efficiency, and ensuring security by preventing a robot from being stolen or falling from a table.

When a robot is used on a desk without self-traveling, the robot is loaded on the upper surface of the table. An upper plate extends from the center of the upper surface part to the end of the table. An upper key hole is formed in the table at the portion corresponding to the end thereof. Through-holes are formed in the table corresponding to an insert part and a screw hole. A screw comprises a head part brought into contact with a tool and a projecting part inserted into the screw hole of the table. The screw is secured to the insert part through the screw hole and the through-hole. The low plate extends from the center to the end of the table. A lower key hole is formed in the lower plate at the portion corresponding to the end thereof. The lower plate is so installed on the lower surface part of the table that the upper key hole and the lower key hole are aligned with each other, and covers the head part of the screw. The lower plate is secured to the table and the upper plate by inserting the key for the lock part with a wire into the upper key hole and the lower key hole.

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