This paper discusses an inverse source problem 
for time-harmonic Maxwell's equations.
We consider the propagation of electromagnetic waves in a homogeneous space.
Here, the source term is expressed by electric current dipoles.
For the above problem, we propose an identification method 
of dipoles from the data of electric and magnetic fields.
This method is based on boundary integrals using vector-valued 
weighting functions.
By the proper choice of weighting functions, 
we can identify locations and moments of dipoles 
without any iterative procedures.
The error estimates for identified results are also obtained.
The effectiveness of our method is shown by numerical examples.