PROBLEM TO BE SOLVED: To provide a fertilizer scanning device capable of visually confirming a window part disposed below a hopper, accurately from an obliquely upper portion.SOLUTION: A fertilizer scanning device 1 comprises: a hopper 2 having a front surface inclined plate 22f and a longitudinal window part 4 disposed in the front surface inclined plate 22f of the hopper 2 for visually confirming a fertilizer in the hopper 2, wherein there is formed a notch 41 having an upper end side displaced in a transversely outer direction at both right and left sides of the front surface inclined plate 22f so that the entirety thereof is inclined. Into this notch 41, there is inserted a transparent member 42 having a bulge 43 at the center of a flange 44, so that the bulge 43 is protruded, while the window part 4 is being wholly inclined, from the front surface inclined plate 22f.
