To provide a method and an apparatus for manufacturing electric resistance welded tubes by which the electric resistance welded tubes having a required length are obtained while being transferred by small-scale equipment, and also production of chips and burrs can be reduced.

Dividing grooves recessing a strip-like steel sheet 2 over the width direction are formed at required length intervals and the electric resistance welded tubes 9 after welding are cut by shifting the axis in the direction vertical to the axis before and behind the dividing grooves. The dividing groove has an approximately V-shaped cross section and the depth is taken as (the thickness of the steel sheet0.8 to 0.9).