Suction device 10 includes swirl flow-forming body 1 that forms a swirl flow to apply suction to material F by use of Bernoulli's principle, and case 2 that houses swirl flow-forming body 1, and guides flow of a fluid flowing out of concave part 12 of swirl flow-forming body 1. Case 2 includes guide part 21, flange part 22, and cover part 23. Guide part 21 controls flow of a fluid flowing out of concave part 12 of swirl flow-forming body 1 and flowing along end face 13, such that the fluid flows in a direction away from a position of material F. Flange part 22 forms, between flange part 22 and end face 13, a flow path for a fluid to flow out of concave part 12. Cover part 23 is fixed on the top surface of main body 11 of swirl flow-forming body 1.
