We studied the effect of ultraviolet B irradiation on superoxide dismutase activity, ceruloplasmin level in the plasma, and steroid hormone concentration in the adrenal glands of C57Bl/6 mice subjected to immobilization stress. Ultraviolet B irradiation did not abolish the increase in superoxide dismutase activity, but decreased ceruloplasmin level in the plasma and corticosteroid concentration in the adrenal glands of mice exposed to immobilization stress.