PURPOSE: To obtain an inclination detector capable of stable inclination detection.

CONSTITUTION: An inspection plate 15 is pressed on the copper foil face of a copper spread lamination plate 5 and each electrode d11... and d10... is opposed to the copper foil face of the copper spread lamination plate 5. The electrodes d10... set on a ground level comes into contact with a plane part of the copper foil face, so that the copper foil face becomes the ground level. The electrodes opposed to and brought into contact with the plane part of the copper foil face of the ground level become the ground level and the other electrodes opposed to and out of contact with an inclination part become power source voltage +V because they are pulled up. Accordingly, electrode voltages of each lateral row are added and their sum is compared with a reference value for the purpose of detection of a boundary part between the inclination part and the plane part.