A device for producing a disposable wearable article, comprising: a doubling unit provided in a line for continuously conveying a sheet and configured to double the sheet together with an absorber such that opposite side edges of the sheet having the absorber arranged thereon are proximate to or overlapped with each other; and a joining/cutting unit provided in the line and configured to join parts of the doubled sheet at opposite sides of a crotch part having the absorber arranged thereon and then cut the joined parts, the joining/cutting unit including a drum having a peripheral surface and rotatable with the doubled sheet placed on the peripheral surface, at least one joining mechanism configured to join the parts of the doubled sheet at the opposite sides of the crotch part between the joining mechanism and the drum, a cutting mechanism arranged downstream of the joining mechanism in a rotating direction of the drum and configured to cut the parts of the sheet joined by the joining mechanism between the cutting mechanism and the drum, a claw member mounted on the drum to be vertically movable with respect to the peripheral surface of the drum, and a vertically moving cam mechanism configured to move the claw member downward to press a part of the sheet between the crotch parts against the peripheral surface of the drum on a side upstream of the at least one joining mechanism in the rotating direction of the drum and move the claw member upward to release the pressing on a side downstream of the cutting mechanism in the rotating direction of the drum, the vertically moving cam mechanism including a cam disc having an eccentric cam groove, facing a side surface of the drum and coaxially arranged with the drum and a cam follower provided on the claw member and configured to be engaged with the eccentric cam groove so that the claw member vertically moves according to the rotation of the drum, and the joining/cutting unit further including a phase adjusting mechanism capable of adjusting a phase of the eccentric cam groove with respect to the drum. a doubling unit provided in a line for continuously conveying a sheet and configured to double the sheet together with an absorber such that opposite side edges of the sheet having the absorber arranged thereon are proximate to or overlapped with each other; and a joining/cutting unit provided in the line and configured to join parts of the doubled sheet at opposite sides of a crotch part having the absorber arranged thereon and then cut the joined parts, the joining/cutting unit including a drum having a peripheral surface and rotatable with the doubled sheet placed on the peripheral surface, at least one joining mechanism configured to join the parts of the doubled sheet at the opposite sides of the crotch part between the joining mechanism and the drum, a cutting mechanism arranged downstream of the joining mechanism in a rotating direction of the drum and configured to cut the parts of the sheet joined by the joining mechanism between the cutting mechanism and the drum, a claw member mounted on the drum to be vertically movable with respect to the peripheral surface of the drum, and a vertically moving cam mechanism configured to move the claw member downward to press a part of the sheet between the crotch parts against the peripheral surface of the drum on a side upstream of the at least one joining mechanism in the rotating direction of the drum and move the claw member upward to release the pressing on a side downstream of the cutting mechanism in the rotating direction of the drum, the vertically moving cam mechanism including a cam disc having an eccentric cam groove, facing a side surface of the drum and coaxially arranged with the drum and a cam follower provided on the claw member and configured to be engaged with the eccentric cam groove so that the claw member vertically moves according to the rotation of the drum, and the joining/cutting unit further including a phase adjusting mechanism capable of adjusting a phase of the eccentric cam groove with respect to the drum.