A body fluid collector is provided with: an aspiration section (1) that aspirates a body fluid； a main body section (2) that comprises an air passage (21) through which a gas for discharging the body fluid that is aspirated by the aspiration section (1) passes； and a blocking section (3) that is provided between the main body section (2) and the aspiration section (1) that has formed therein an opening (31) having a tapered shape in which the inner diameter of the main body section (2) side is smaller than the inner diameter of the aspiration section (1) side and that blocks the body fluid that is aspirated by the aspiration section (1) from flowing into the main body section (2). As a result of the inner diameter of the opening (31) that is formed in the blocking section (3) being smaller than the inner diameter of the aspiration section (1) at a surface at which the aspiration section (1) and the blocking section (3) come into contact the aspiration section (1) is blocked from aspirating an amount of the body fluid that is greater than a predetermined amount.
