The body fluid collection device is provided with: an extended shaft member in which a lumen is formed along the longitudinal axis and which can be inserted inside a channel; a sealing member for sealing between the extended shaft member, which is closer to the tip than the suction port, and said channel so that fluid does not flow from the tip of the extended shaft member towards the base end; and a filter, which is provided in the lumen and allows gases to pass but does not allow liquids to pass. A hole for connecting the channel, on the base end side of the sealing member, with the lumen, on the base end side of the filter, is formed in the extended shaft member.