To provide an unnecessary radiation measuring device, which may quickly and precisely specify the direction where the intensity of unnecessary radiation generated by an electronic device becomes maximum without depending upon a worker's experience and intuition.

A plurality of antenna elements 120 are disposed like a celestial sphere to surround an electronic device EUT as a measured object, and unnecessary radiation generated by the electronic device EUT is received by the plurality of antenna elements 120. The antenna element 120 which has received the unnecessary radiation of the maximum intensity is specified according to a signal received by the plurality of antenna elements 120. According to the relationship between the specified antenna element 120 and the electronic device EUT, the direction of the unnecessary radiation having the maximum intensity is specified.