To finely adjust the angle of a ruler plate, keeping a set angle of the ruler plate.

This planer transfers a material W to be worked along a surface plate 1 in the horizontal direction along a ruler plate 2 erected to the surface plate 1 to perform a desired cutting fabrication. In this case, the planer is equipped with an angle adjustment means A for adjusting the angle of the ruler plate 2, a fixing means B for fixing the ruler plate 2 at a position adjusted by the angle adjustment means A, and a holding means C for maintaining the state of the ruler plate 2 fixed by the fixing means B.