To provide a web processing apparatus which can suppress streaking troubles with foreign matter by using a bar having at least two spiral grooves in different spiral directions and can also remove the effects of the streaking troubles in the boundary part of two spiral grooves.

The web processing apparatus 10 comprises an application treatment part 14 to carry out coating of a long web 12 by using a bar 22 having two spiral grooves X and Y different in the spiral directions and a cutting treatment part 18 for cutting the coated web 12 at the coating position in the boundary part Z between the spiral grooves X and Y in the longitudinal direction.