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An instantaneous charge-separated field, built up at the femtosecond-laser-irradiated surface of a copper film, was observed by time-resolved electron imaging using an energy-chirped electron probe-beam. The probe beams with effective energies of
170
keV
were generated by intense femtosecond laser irradiation onto a molybdenum target at an intensity of
10
17
W
∕
cm
2
. From the deflection of the probe electrons, the electric field was estimated to be
1.5
MV
∕
m
at a pump-laser intensity of
10
15
W
∕
cm
2
.