PROBLEM TO BE SOLVED: To provide a charge subsidence behavior measuring device and a charge subsidence behavior measuring method capable of detecting a subsidence abnormality at an arbitrary point on the inner surface of a furnace and efficiently measuring the subsidence behavior of the subsidence abnormality point. SOLUTION: A charge sinking behavior measuring device 9 is a device for measuring the sinking behavior of a charged material surface 24 filled in a furnace of a blast furnace 10, and is a device that can be introduced into the furnace and has a charged material surface 24. A non-contact type distance measuring device 42 capable of measuring the heights of a plurality of points in the above, and a distance measuring device 42 measuring and measuring the heights of a plurality of points on the surface 24 of the charge at each predetermined detection cycle. The subsidence abnormality detection unit 52 that detects the subsidence abnormality point from the height, and the height of the subsidence abnormality point is measured by the distance measuring device 42 at each predetermined measurement cycle shorter than the detection cycle, and the subsidence abnormality is measured from the measured height. It has a sinking behavior measuring unit 53 for measuring the sinking behavior of a point. [Selection diagram] Fig. 1
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