To provide an electric measuring instrument capable of measuring the supplied quantity of electricity supplied for each electric apparatus from a plurality of branch breakers in a distribution panel and reducing the space of its installation location.

The electric measuring instrument 200 can measure the supplied quantity of electricity supplied for each electric apparatus from the plurality of branch breakers 150A-150D in the distribution panel. The electric measuring instrument 200 includes electric measuring parts 10A and 10B and a matrix switch 60. The electric measuring parts 10A and 10B measure each quantity of electricity supplied from each of the branch breakers 150A-150D and are of a number smaller than the number of the branch breakers 150A-150D. The matrix switch 60 is arranged between the branch breakers 150A-150D and the electric measuring parts 10A and 10B and can change over an object to be measured between the electric measuring parts 10A and 10B.