A method of manufacturing a conductive member includes (a) a step of preparing a long conductive member provided with a cutting target in an extension direction portion, and (b) a step of firing a high energy-density beam at the cutting target while moving the high energy-density beam in a direction that intersects with the extension direction of the long conductive member, and also cutting the cutting target at, at least, a portion where the high energy-density beam moves, such that a dimension of the cutting target in a firing direction of the high energy-density beam gradually increases.