Current interrupting device and the power storage device using the same

Current interrupting device includes a first current-carrying member and the second current-carrying member and the first deformable member and the second deformable member. First conducting member is fixed to the case. The second current-carrying member is disposed at a position opposed to the first current-carrying member. First deformable member, the pressure inside the casing when the predetermined value or less in contact with the second current-carrying member, the pressure inside the case becomes the second current-carrying member in a non-contact when exceeds a predetermined value. The second deformable member, the shape of the projection is provided projecting toward the center of the second current-carrying member. When the pressure inside the case exceeds a predetermined value, the protrusion comes into contact with the second conducting member. The first conducting member, regulating structure for regulating the movement of the first deformable member. Second current-carrying member, regulating structure for regulating the movement of the second deformable member.