An electric field imaging device is provided with which it is possible to visualize as a dynamic state an electromagnetic field intensity distribution and a phase delay/advance distribution in the vicinity of a product, using a sample of the actual product without lead-out lines. The electric field imaging device includes: an antenna which accepts a high-frequency signal emitted by the sample as an input; an electrooptic (EO) crystal plate which is a frequency fRF high-frequency electric field sensor; a flashing light source which radiates polarized light onto the EO crystal plate; an optical system leading to an analyzer for detecting phase changes in polarized light obtained by means of the EO crystal plate; an image capturing device which converts an in-plane distribution of optical beam from the analyzer into an electrical signal; and an information processing device which processes and displays an output signal from the image capturing device.