A manufacturing method of a composite sheet of an absorbent article in which a continuous body of an elastic strip member is joined in a predetermined meander pattern in respect to a continuous body of a sheet that is continuously transported in a transporting direction, the method comprising: a first joining of joining a continuous body of a first elastic strip member to a continuous body of a sheet by feeding and surface-contacting the continuous body of the first elastic strip member to the continuous body of the sheet, via a first oscillating arm that oscillates in a direction intersecting the transporting direction with a first spindle portion as a swivel center; and a second joining of joining a continuous body of a second elastic strip member to the continuous body of the sheet by feeding and surface-contacting the continuous body of the second elastic strip member to the continuous body of the sheet, via a second oscillating arm that oscillates in a direction intersecting the transporting direction with a second spindle portion as a swivel center, wherein the first oscillating arm includes a first oscillating end side roller provided to an oscillating end side of the first oscillating arm and a first spindle portion side roller provided to the first spindle portion side, wherein the second oscillating arm includes a second oscillating end side roller provided to an oscillating end side of the second oscillating arm and a second spindle portion side roller provided to the second spindle portion side, wherein in the first joining, the continuous body of the first elastic strip member supplied toward the first spindle portion side roller through a first supply route is subsequently put around an outer circumferential face of the first spindle portion side roller and an outer circumferential face of the first oscillating end side roller, and, after being reversed in a travel direction with the first oscillating end side roller, is placed on the continuous body of the sheet and joined thereon, wherein in the second joining, the continuous body of the second elastic strip member supplied toward the second spindle portion side roller through a second supply route is subsequently put around an outer circumferential face of the second spindle portion side roller and an outer circumferential face of the second oscillating end side roller, and, after being reversed in the travel direction with the second oscillating end side roller, is placed on the continuous body of the sheet and joined thereon, wherein a first placing position where the continuous body of the first elastic strip member is to be placed on the continuous body of the sheet with the first oscillating arm and a second placing position where the continuous body of the second elastic strip member is to be placed on the continuous body of the sheet with the second oscillating arm are different from each other in the transporting direction. a first joining of joining a continuous body of a first elastic strip member to a continuous body of a sheet by feeding and surface-contacting the continuous body of the first elastic strip member to the continuous body of the sheet, via a first oscillating arm that oscillates in a direction intersecting the transporting direction with a first spindle portion as a swivel center; and a second joining of joining a continuous body of a second elastic strip member to the continuous body of the sheet by feeding and surface-contacting the continuous body of the second elastic strip member to the continuous body of the sheet, via a second oscillating arm that oscillates in a direction intersecting the transporting direction with a second spindle portion as a swivel center, wherein the first oscillating arm includes a first oscillating end side roller provided to an oscillating end side of the first oscillating arm and a first spindle portion side roller provided to the first spindle portion side, wherein the second oscillating arm includes a second oscillating end side roller provided to an oscillating end side of the second oscillating arm and a second spindle portion side roller provided to the second spindle portion side, wherein in the first joining, the continuous body of the first elastic strip member supplied toward the first spindle portion side roller through a first supply route is subsequently put around an outer circumferential face of the first spindle portion side roller and an outer circumferential face of the first oscillating end side roller, and, after being reversed in a travel direction with the first oscillating end side roller, is placed on the continuous body of the sheet and joined thereon, wherein in the second joining, the continuous body of the second elastic strip member supplied toward the second spindle portion side roller through a second supply route is subsequently put around an outer circumferential face of the second spindle portion side roller and an outer circumferential face of the second oscillating end side roller, and, after being reversed in the travel direction with the second oscillating end side roller, is placed on the continuous body of the sheet and joined thereon, wherein a first placing position where the continuous body of the first elastic strip member is to be placed on the continuous body of the sheet with the first oscillating arm and a second placing position where the continuous body of the second elastic strip member is to be placed on the continuous body of the sheet with the second oscillating arm are different from each other in the transporting direction.