A method for manufacturing an underpants-type wearable article where a joining defect of an elastic stretchable member can be easily checked. The method includes: a rubber-thread-sandwiching-step; a continuous-body-forming-step of forming continuous bodies of front and backside waist members; a side-fusing-step of joining both side portions of the front and back members to each other by side fusing using a pair of side fusing portions; a rubber-thread-cutting-step of cutting the rubber threads of the respective continuous bodies of the front and back members at a protruding portion of a boundary region which becomes a boundary of individual wearable article; a joining-state-inspection-step of inspecting a joining state of the rubber threads to a pair of nonwoven fabric; and a continuous-body-cutting-step of obtaining individual wearable articles by cutting the respective continuous bodies of the front and back member at the protruding portion of the boundary region.