A measurement device comprises: a container 1 including an aperture 6a; a lining 2 applied to an inner surface of the container 1; an electrode 3 provided in the aperture, and a spring 7 biasing the electrode 3 in a direction from the inside to the outside of the container 1. The electrode 3 includes: an electrode head 3a; an anchor 4 formed on an outer peripheral portion of the electrode head 3a; an electrode shaft 3b formed integrally with the electrode head 3a; and an electrode tapered portion 5 tapered with its diameter gradually reduced from the anchor 4 to the electrode shaft so as to fit in the aperture. The electrode 3 is inserted from the inside of the container 1 so as to expose a part of the electrode shaft 3b out of the container 1.