to a tangential line on the inner wall surface of the cyclone main body 4 and in a horizontal direction as a result since the swing speed of a rotational flow in the cyclone main body 4 is accelerated effectively and the centrifugal force of the rotational flow is increased powder contained in the first fluid can be recovered with a high cyclone yield furthermore in the cyclone device 2 according to this embodiment in the case where the collecting section 12 is provided with a function to discharge collected powder to the outside of a system since it is not necessary to stop operation of the cyclone system for each time when collected powder is recovered the cyclone system can be operated continuously in addition since impurities such as fiber of the bag filter 92 do not mix fine particles with high purity can be collected fig5 is a diagram showing a relationship between a cyclone yield and an existence or non existence of the bending portion 7 in the first introduction pipe 6 here in the description of fig5 a first introduction pipe not having the bending portion 7 is written as a non existence a straight pipe and the first introduction pipe 6 having the bending portion 7 according to the present embodiment is written as an existence a curved pipe fig5 shows a.