The invention discloses a drift plate and a jet flow device. The drift plate is configured to allow improved convenience in inspection of parts, observation of dross deposition, etc. during maintenance. The drift plate is configured so that: multiple paired structures obtained from a guide plate (11) and a guide plate (12), each of which has a wide U-shaped cross-sectional shape and a specified height, are disposed with the guide plates (11, 12) staggered to the left and right when viewed from the main direction of flow of a molten fluid; and by causing fluid to flow in from openings formed by the edges of the guide plates (11, 12), the inner surfaces of which face each other, the inflowing fluid is rotated inside the paired structures while the flow of said fluid is changed from the horizontal direction to the vertical direction. The paired structures form units by being held and fixed at a constant interval in the main flow direction of the molten fluid by connecting-holding rods (13a, 13b, 13c). Guide plates (11, 12) at specified positions have component-attaching sections (11b, 12b) for attaching to a jet flow device.