A blood sample container (1A) according to the present invention includes: a container body section (2) having an internal space (3) for storing initial flow blood to be used for testing a blood inflow port (5) that allows the initial flow blood to flow in a blood outflow port (6) that allows the initial flow blood to flow out and an exhaust section (7) having a hydrophilic and bacteria-impermeable filter (12) that allows the air in the internal space (3) to be discharged, the exhaust section (7) being positioned at an upper end of the container body section (2) when the container body (1A) is used in a manner such that the blood outflow port (6) faces in a vertical direction and having a small-diameter tubular passage (11) that allows the air in the internal space (3) to be discharged by a predetermined amount of the initial flow blood that has flown into the passage (11).
