In an agricultural material supply device equipped with a material tank, an extracting supply unit for extracting agricultural material from the material tank, and supplying the extracted agricultural material to the packaging, and an optical detection mechanism for detecting the amount of agricultural material in the material tank. , It makes it difficult for a signal processing unit to fail in an optical detection mechanism, and also makes it easy to perform the mainance of the signal processing unit. The detection part 60A provided with the light transmitting part 61 and the light receiving part 62 is provided inside the material tank 30A. A signal processing unit 60B including a light source 66 and a detection light processing unit 67 that converts the detection light into electrical signals is provided outside the material tank 30A. The detection light transmission path portions 68A and 68B for connecting the signal processing portion 60B and the detection portion 60A are provided. The detection light transmission path portions 68A and 68B are provided with a connection portion 70 that detachably connects the signal processing portion 60B and the detection portion 60A.
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