A body fluid sampling device (100) includes: a connecting portion (105) to which a body fluid container is connected; a suctioning portion (117) which suctions a gas in the body fluid container connected to the connecting portion, to introduce a body fluid into the body fluid container; a suctioning passage (105a) which causes an inside of the suctioning portion and an inside of the body fluid container connected to the connecting portion, to be communicated with each other; a first electrode (112) which is disposed to extend across the suctioning passage and has gas permeability; a second electrode (113) which is disposed to extend across the suctioning passage and be opposed to the first electrode, and has gas permeability; and a detector which detects an electric signal generated between the first electrode and the second electrode. With this, the present invention provides the body fluid sampling device capable of detecting improper suctioning of the body fluid, and a body fluid measuring device using the body fluid sampling device.