Capacitor, capacitor case, and substrate provided with circuit

In the present invention, the discharge direction of gas discharged from a safety valve is constantly specified in a set direction when a capacitor is attached to a substrate laterally with respect to the substrate surface without increasing the complexity of the production step of the capacitor. Provided is a capacitor that has at least: a capacitor body (20); two lead lines (24A, 24B) provided to one end surface (22A); a protrusion (26) provided roughly to the center of the other end surface; and at least two safety valves (28A, 28B) provided to the other end surface (22B). In the other end surface (22B), the at least two safety valves (28A, 28B) are disposed in a manner so as to be roughly rotationally symmetrical with respect to the protrusion (26), and the center line in the axial direction of the protrusion (26) and the center line in the axial direction of the capacitor (10A) roughly match. Further provided are a capacitor case used in the capacitor and a substrate that is provided with a circuit and t