The structure of a superconducting vortex in a dirty antiferromagnetic supe
rconductor (AFSC) has been studied theoretically. We show that a supercondu
cting vortex in AFSC has an antiferromagnetic core. The existence of superc
onducting vortex with antiferromagnetic cores may have nontrivial influence
upon transport properties of type-II AFSC in magnetic field.