A method for forming compression-bonding portions (jm) 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 (jm) 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 (jm) in the continuous body of the web member, using a compression-bonding member (41R, 42R, 43R) and the rotator, when the formation target part passes through a position of the compression-bonding member disposed at a predetermined position in the direction of rotation, to form the compression-bonding portions; and pressing the continuous body of the web member in a radial direction towards the axis of rotation of the rotator using a pressing member, while avoiding forming the compression-bonding portions in the continuous body of the web member, said pressing member being disposed to be opposed to the outer peripheral surface of the rotator, at a position upstream in the direction of rotation with respect to the compression-bonding member (41R, 42R, 43R), and the continuous body of the web member being in contact with an auxiliary roll such that the continuous body of the web member is held on the outer peripheral surface of the rotator from a position upstream, in the direction of rotation, with respect to a pressing position (P61R) of said pressing member, the auxiliary roll being configured to rotate around a rotational axis along the CD direction. 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 (jm) in the continuous body of the web member, using a compression-bonding member (41R, 42R, 43R) and the rotator, when the formation target part passes through a position of the compression-bonding member disposed at a predetermined position in the direction of rotation, to form the compression-bonding portions; and pressing the continuous body of the web member in a radial direction towards the axis of rotation of the rotator using a pressing member, while avoiding forming the compression-bonding portions in the continuous body of the web member, said pressing member being disposed to be opposed to the outer peripheral surface of the rotator, at a position upstream in the direction of rotation with respect to the compression-bonding member (41R, 42R, 43R), and the continuous body of the web member being in contact with an auxiliary roll such that the continuous body of the web member is held on the outer peripheral surface of the rotator from a position upstream, in the direction of rotation, with respect to a pressing position (P61R) of said pressing member, the auxiliary roll being configured to rotate around a rotational axis along the CD direction.