Blood gas values such as pO$_2$ were studied in common marmosets, crab-eating macaques and Japanese macaques, rhesus macaques and celebes macaque reared in Korea. Blood pH and blood gas values were evaluated in both arterial and venous blood. pH, p$CO_2$, and pO$_2$, of arterial blood in common marmosets were measured as 7.4$pm$0.1, 29.2$pm$3.6 mmHg and 81.5$pm$8.9 mmHg, respectively. Corresponding values in one crab-eating macaque were 7.3, 41.3 mmHg and 46.5 mmHg, respectively. In case of venous blood, pH, p$CO_2$, and pO$_2$, in common marmosets were observed as 7.2$pm$0.2, 64.9$pm$18.3 mmHg and 23.5$pm$5.4 mmHg, respectively. On the while, pH, p$CO_2$, and pO$_2$, of venous blood in crab-eating macaques showed 7.2$pm$0.2, 49.9$pm$8.0 mmHg and 38.3$pm$8.8 mmHg, respectively. Venous pH, p$CO_2$, and pO$_2$, in Japanese macaques were 7.1$pm$0.2, 56.4$pm$5.3 mmHg and 40.1$pm$9.3 mmHg, respectively. Those values in one rhesus macaque were 7.2, 61.1 mmHg and 24.9 mmHg, and in celebes macaque were 7.1, 54.3 mmHg and 31.8 mmHg, respectively.