PURPOSE: To obtain a poly-face splittable printed circuit board capable of being bent and detached at a specified position easily and accurately by shapedly providing a groove extending in the predetermined direction in a bendable and detachable manner selectively and forming the depth of the groove so that it has approximately a waveform along the direction of extension of the groove.

CONSTITUTION: Comparatively easily cut sections (little residual allowance 3 sections) and comparatively cut-difficult sections (much residual allowance 3 sections) are shaped alternately to a printed circuit board 1 so that the depth of each groove 4a to 4c being formed separably by bending and extending in the fixed direction is formed to a waveform along the direction of extension. That is, the easily bendable and detachable sections (the thick residual allowance sections 3) and the bending-detaching-difficult sections (the thick residual allowance sections 3) are mixed in bending and detaching in the grooves 4a∼4c. Accordingly, elements are separated easily at specified positions in the processes of actual bending and detaching, thus allowing a change into single products.