A blood oxygenating apparatus (1) comprises a blood delivery mechanism-equipped blood reservoir including a blood storing portion (10); a blood delivery mechanism having blood reserving members (3a,3b) having delivery blood reserving portions (30a,30b) communicating with the blood storing portion (10) and reserving blood in an amount proportional to an amount of blood stored in the blood storing portion (10) when the amount of the blood stored in the blood storing portion (10) becomes equal to or less than a predetermined value and capable of flowing out blood stored in the delivery blood reserving portions (30a,30b) when the delivery blood reserving portions (30a,30b) are pressed from outside; and a heat exchange function-provided oxygenator (5) connected with a blood outlet port of the blood delivery mechanism-equipped blood reservoir (2). The blood outlet port of the oxygenator (5) communicates with the vicinity of an upper end of a blood chamber provided inside the oxygenator (5).
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