A swirl flow-forming body, comprising: a main body; a first end face that is formed at the main body and faces a member to which suction is applied such that the member can be held and conveyed; a hole that opens on the first end face; a jetting port that is formed on an inner periphery of the main body, the inner periphery facing the hole; and a first fluid passage that allows fluid to be discharged into the hole via the jetting port so as to form a swirl flow that generates negative pressure for applying suction to the member, wherein the inner periphery is formed so as to guide fluid discharged via the jetting port, in a direction away from the member, to be discharged from the hole; wherein at least part of the inner periphery is formed such that a cross-sectional area of the hole expands with distance from the member; wherein the hole is a through-hole that opens on the first end face and a second end face opposite to the first end face; and the inner periphery is formed so as to guide fluid discharged via the jetting port, toward an opening of the second end; and the swirl flow-forming body further comprises: a plate body; and a holding member that holds the plate body such that the plate body faces the second end face, and that forms, between the second end face and the plate body, a flow path for fluid that has flowed out from the hole, and wherein the plate body covers the hole thereby controlling inflow of fluid to the hole. a main body; a first end face that is formed at the main body and faces a member to which suction is applied such that the member can be held and conveyed; a hole that opens on the first end face; a jetting port that is formed on an inner periphery of the main body, the inner periphery facing the hole; and a first fluid passage that allows fluid to be discharged into the hole via the jetting port so as to form a swirl flow that generates negative pressure for applying suction to the member, wherein the inner periphery is formed so as to guide fluid discharged via the jetting port, in a direction away from the member, to be discharged from the hole; wherein at least part of the inner periphery is formed such that a cross-sectional area of the hole expands with distance from the member; wherein the hole is a through-hole that opens on the first end face and a second end face opposite to the first end face; and the inner periphery is formed so as to guide fluid discharged via the jetting port, toward an opening of the second end; and the swirl flow-forming body further comprises: a plate body; and a holding member that holds the plate body such that the plate body faces the second end face, and that forms, between the second end face and the plate body, a flow path for fluid that has flowed out from the hole, and wherein the plate body covers the hole thereby controlling inflow of fluid to the hole. a plate body; and a holding member that holds the plate body such that the plate body faces the second end face, and that forms, between the second end face and the plate body, a flow path for fluid that has flowed out from the hole, and wherein the plate body covers the hole thereby controlling inflow of fluid to the hole.