To provide a technology that can simply and appropriately pre-estimate the quality of a product produced in a production line.SOLUTION: A quality pre-estimation device relating to one profile of the present invention comprises: a first acquisition unit that acquires first information about the posture of a worker who performs work included in a process for producing a product in a production line; a second acquisition unit that acquires second information about the state of a tool that the worker uses for the work; a pre-estimation unit that pre-estimates the quality of the product that is produced through the work according to a degree to which the posture of the worker presented by the first information conforms to a prescribed first standard and according to a degree to which the tool-using state presented by the second information conforms to a prescribed second standard; and an output unit that outputs information about the pre-estimated results of the quality of the product.SELECTED DRAWING: Figure 4
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