Electrical power measurement device

An electrical power measurement device that measures electrical power consumed in a circuit to be measured including a power source, a load, and a pair of electric wires connecting the power source with the load, comprising:

• a pair of connection terminals for connecting the load in parallel to the power source;
• a sensor part including a magnetic element in which element terminals are formed at both ends of a magnetic film, a measurement resistor connected to the magnetic element in series, and a detecting means that detects a voltage change of the magnetic element and outputs a predetermined component, the sensor part being connected to the circuit to be measured via the pair of connection terminals;
• a sensor unit including a plurality of the sensor parts;
• an addition means that adds outputs of the detecting means of all the sensor parts;
• and
• a fixing means that fixes the magnetic elements of the sensor parts, at equal distance positions from a virtual axis serving as a position reference at which the one electric wire is arranged, in a direction facing the virtual axis.