To reduce the restriction of measuring emvironment and improve operability by partitioning a plurality of compact loop antennas with a shield material to dispose linearly the antennas and make the whole rod-like.

In the radiation electromagnetic wave measuring sensor 6, a compact loop type receiver antennas 1 are linearly disposed in the a thin rod partitioned by shield materials 2. The sensor 6 is inserted in an electronic apparatus 7 under the operative condition and connected to a measuring instrument 3 and personal computer 4. The electromagnetic radiation level value of the objective electronic apparatus 7 in operation is detected by each loop type receiver antenna to be inputted to the personal computer 4. Hence, the distribution of the electromagnetic wave level from parts in the electromagnetic apparatus operated synthetically with the other systems can be measured. Thus, the restriction of the measuring emvironment can be reduced to improve the operability.