To provide a tape lapping device which machines workpieces of different kinds such as crank shafts different in workpiece width without changing setup of a dedicated shoe assembly and a polishing material-coated tape.

There are integrally assembled as a replaceable arm shoe module 20: an arm body 1 fitted to a pair of straight moving slides 11 and 12, which are fixed to a machine main body 10, freely to move in a Z-axis direction toward the machined material 4; a pair of opening/closing arms 6 and 6 fitted to the arm main body 1; shoe assemblies 5 and 5 having a pair of relatively rigid recessed surfaces supported by the pair of opening/closing arms 6 and 6; and an arm opening/closing clamp cylinder 7. When machining with tape lapping, after machining with the narrow shoe assembly 50 and the polishing material-coated tape 51, a non-machined surface 40 of a rotary shaft is machined by moving the narrow shoe assembly 50 and the polishing material-coated tape 51 in the axial direction of the machined material.

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