A mechanical scribing apparatus with controlling force of a scribing cutter for adaptively separating each unit of thin film solar cells formed on a single substrate, which is always capable of performing a predetermined minute scribing of a work in accordance with a wear loss of a scribing cutter. This apparatus is provided with a scribing means for placing a scribing cutter having a cylindrical body tapered at a specified tapering angle and having a flat tip face at a specified surface position of the work, pressing the cutter with a specified pressure force to the surface of the work and moving the cutter on the surface of the work, a means for measuring the size of a flat tip face of the scribing cutter and a means for variably controlling the pressure force of the scribing cutter in accordance with the measured size of the flat tip face of the cutter.
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