The present invention is intended to prevent cutting of the resilient and elastic members by a welding process. The foregoing issue is solved by passing a first sheet layer (21), a second sheet layer (22), and elongated resilient and elastic members (19) continuously disposed in an MD direction between the two sheet layers, between a first roll (90) with joint convex parts (91) provided at circumferential intervals on an outer peripheral surface and a second roll (92) opposed to the first roll (90), and pressurizing and heating the first sheet layer (21) and the second sheet layer (22) to form sheet joined sections (70) by welding the first sheet layer (21) and the second sheet layer (22) in such a manner as to cross the resilient and elastic members (19) and have MD-direction intervals therebetween, wherein circumferentially continuous grooves (92d) are formed on a pressurization surface of the second roll (92), passage sections of the resilient and elastic members (19) are pressurized and heated in positions including the grooves (92d) of the second roll (92), and non-passage sections of the resilient and elastic members (19) are pressurized and heated in positions not including the grooves (92d) of the second roll (92).
