A bodily fluid sampler comprises: a suction part 1 that sucks the bodily fluid; a main body part 2 that includes a ventilation channel 21 which allows gas for discharging the bodily fluid sucked by the suction part 1 to pass therethrough; and a blocking part 3 that is provided between the main body part 2 and the suction part 1, the blocking part being formed with an opening part 31 in a tapered form, with an inner diameter thereof on the main body part 2 side being smaller than an inner diameter thereof on the suction part 1 side, and the blocking part 3 preventing the bodily fluid sucked by the suction part 1 from flowing into the main body part 2. An inner diameter of the opening part 31 formed in the blocking part 3 is smaller than an inner diameter of the suction part 1 at a surface where the suction part 1 and the blocking part 3 make contact with each other, and thus, the bodily fluid is prevented from being sucked by the suction part 1 more than a predetermined amount.