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The Y 2 Co 7-x Ni x B 3 compounds crystallize in a hexagonal structure of the Ce 2 Co 7 B 3 -type for x ≤ 4. Magnetic measurements were performed in the temperature range 4 -800 K and in fields up to 8 T. The compounds with x ≤ 3 are ferromagnetically ordered. Y 2 Co 3 Ni 4 B 3 is found to be paramagnetic in the studied temperature range. The experimental data were compared with the results obtained from band structure calculations using the TB-LMTO method in the ASA approximation. The magnetic behavior of cobalt in these compounds is analyzed within the theory of spin fluctuations.