A method for forming compression-bonding portions in a continuous body of a web member including a fiber bundle, while conveying the continuous body in a predetermined direction set as a direction of conveyance, the fiber bundle being continuous in the predetermined direction while a fiber direction is set along the predetermined direction, the compression-bonding portions being formed at intervals in the direction of conveyance, the method comprising: rotating a rotator around a rotation axis along a CD direction intersecting with the direction of conveyance, while holding the continuous body of the web member on an outer peripheral surface of the rotator, to convey the continuous body of the web member in a direction of rotation of the rotator set as the direction of conveyance; compressing a formation target part (jmp) of each of the compression-bonding portions in the continuous body of the web member, using a first compression-bonding apparatus and the rotator, when the formation target part passes through a position (P41R) of the first compression-bonding apparatus disposed at a predetermined position in the direction of rotation, to form the compression-bonding portions of a first stage; and further compressing each of the compression-bonding portions of the first stage using a second compression-bonding apparatus and the rotator, when the compression-bonding portion of the first stage passes through a position (P42R) of the second compression-bonding apparatus disposed downstream in the direction of rotation from the first compression-bonding apparatus, to form the compression-bonding portions of a second stage, the compression-bonding portions of the first stage including at least one compression-bonding portion that is positioned between the first compression-bonding apparatus and the second compression-bonding apparatus in the direction of rotation when the second compression-bonding apparatus compresses the compression-bonding portion of the first stage. rotating a rotator around a rotation axis along a CD direction intersecting with the direction of conveyance, while holding the continuous body of the web member on an outer peripheral surface of the rotator, to convey the continuous body of the web member in a direction of rotation of the rotator set as the direction of conveyance; compressing a formation target part (jmp) of each of the compression-bonding portions in the continuous body of the web member, using a first compression-bonding apparatus and the rotator, when the formation target part passes through a position (P41R) of the first compression-bonding apparatus disposed at a predetermined position in the direction of rotation, to form the compression-bonding portions of a first stage; and further compressing each of the compression-bonding portions of the first stage using a second compression-bonding apparatus and the rotator, when the compression-bonding portion of the first stage passes through a position (P42R) of the second compression-bonding apparatus disposed downstream in the direction of rotation from the first compression-bonding apparatus, to form the compression-bonding portions of a second stage, the compression-bonding portions of the first stage including at least one compression-bonding portion that is positioned between the first compression-bonding apparatus and the second compression-bonding apparatus in the direction of rotation when the second compression-bonding apparatus compresses the compression-bonding portion of the first stage.