A load cell input unit (30, 230, 930), adapted to measure a load of a load cell, the load cell input unit (30, 230, 930) comprising: two applying voltage input terminals, inputting applying voltage values to the load cell; two output voltage input terminals, inputting output voltage values coming from the load cell; a load measuring element, measuring the load based on the applying voltage values and the output voltage values respectively inputted to the applying voltage input terminals and the output voltage input terminals; a mode switching element, switching a mode of the load cell input unit (30, 230, 930) between (i) a measuring mode for measuring the load, and (ii) a broken line detection mode for detecting broken lines of connection cables connecting the load cell and the load cell input unit (30, 230, 930) based on an external instruction; a voltage applying element (211, 311), respectively applying a specified voltage to distribution lines in case that the load cell input unit (30, 230, 930) is in the broken line detection mode and not applying the specified voltage to the distribution lines in case that the load cell input unit (30, 230, 930) is in the measuring: mode wherein the distribution lines respectively connect the two applying voltage input terminals and the two output voltage input terminals to the load measuring element; and a broken line determination element, determining whether a measuring result obtained by the load measuring element is within a proper range when the load cell input unit (30, 230, 930) is in the broken line detection mode and the voltage applying element (211, 311) applies the specified voltage to the distribution lines, so as to determine whether the connection cables have a broken line. two applying voltage input terminals, inputting applying voltage values to the load cell; two output voltage input terminals, inputting output voltage values coming from the load cell; a load measuring element, measuring the load based on the applying voltage values and the output voltage values respectively inputted to the applying voltage input terminals and the output voltage input terminals; a mode switching element, switching a mode of the load cell input unit (30, 230, 930) between (i) a measuring mode for measuring the load, and (ii) a broken line detection mode for detecting broken lines of connection cables connecting the load cell and the load cell input unit (30, 230, 930) based on an external instruction; a voltage applying element (211, 311), respectively applying a specified voltage to distribution lines in case that the load cell input unit (30, 230, 930) is in the broken line detection mode and not applying the specified voltage to the distribution lines in case that the load cell input unit (30, 230, 930) is in the measuring: mode wherein the distribution lines respectively connect the two applying voltage input terminals and the two output voltage input terminals to the load measuring element; and a broken line determination element, determining whether a measuring result obtained by the load measuring element is within a proper range when the load cell input unit (30, 230, 930) is in the broken line detection mode and the voltage applying element (211, 311) applies the specified voltage to the distribution lines, so as to determine whether the connection cables have a broken line.