To provide a measuring device capable of maintaining exact measurement by determining that it becomes an abnormal state that the exact measurement cannot be performed such as block of a vent hole, etc.

A measuring device includes: a belt conveyor 14 which conveys objects W to be measured to be sequentially thrown on a weighing conveyor 32 under a predetermined conveyance condition; weighing means 21 for outputting a weighing signal according to load weight of the objects W to be measured to be conveyed on the weighing conveyor 32; abnormal weighing signal storage means 101 for storing a weighing signal which can be output from the weighing means 21 when the weighing means 21 is at an abnormal state as an abnormal weighing signal; and abnormality diagnosis means 102 for comparing the weighing signal output from the weighing means 21 with the abnormal weighing signal which is stored by the abnormal weighing signal storage means 101 to determine that the weighing signal is abnormal when the weighing signal and the abnormal weighing signal have a common feature.