A spot welding electrode housing apparatus capable of housing a plurality of electrodes for use in spot welding, the apparatus comprising: a housing having a housing passageway therewithin and an electrode withdrawal opening on one end thereof, the housing passageway capable of housing the plurality of electrodes to be arranged side by side and linearly in a direction perpendicular to a central axis of the electrode with fitting recesses of the electrodes for fitting onto a shank end of a welding gun open in a same direction, the electrode withdrawal opening configured to communicate with the housing passageway; a pressing means configured to press one electrode or the plurality of side by side arranged electrodes housed in the housing passageway toward one end of the housing passageway; a lever member swingably supported in the housing and around a swing axial center that extends in a same direction as the central axis of the electrode housed in the housing passageway, and configured to be movable between a first position where the lever member is swung to one side and a tip side of the lever member covers a portion of the electrode withdrawal opening and a second position where the lever member is swung to the other side and the tip side of the lever member exposes the electrode withdrawal opening; and a first biasing means configured to urge and swing the lever member to the one side, characterized in, that a bottom surface of the housing passageway includes a flat bottom surface and a pair of inclined surfaces, the flat bottom surface extending along an extension direction of the housing passageway and being belt-shaped, and the pair of inclined surfaces extending from respective edges of the flat bottom surface away from one another, and the pair of inclined surfaces are positioned such that while the electrode can be housed in the housing passageway with a top end of the electrode being positioned at a bottom surface side of the housing passageway, the electrode juts out and cannot be housed in the housing passageway with a base end of the electrode being positioned at the bottom surface side of the housing passageway. a housing having a housing passageway therewithin and an electrode withdrawal opening on one end thereof, the housing passageway capable of housing the plurality of electrodes to be arranged side by side and linearly in a direction perpendicular to a central axis of the electrode with fitting recesses of the electrodes for fitting onto a shank end of a welding gun open in a same direction, the electrode withdrawal opening configured to communicate with the housing passageway; a pressing means configured to press one electrode or the plurality of side by side arranged electrodes housed in the housing passageway toward one end of the housing passageway; a lever member swingably supported in the housing and around a swing axial center that extends in a same direction as the central axis of the electrode housed in the housing passageway, and configured to be movable between a first position where the lever member is swung to one side and a tip side of the lever member covers a portion of the electrode withdrawal opening and a second position where the lever member is swung to the other side and the tip side of the lever member exposes the electrode withdrawal opening; and a first biasing means configured to urge and swing the lever member to the one side, characterized in, that a bottom surface of the housing passageway includes a flat bottom surface and a pair of inclined surfaces, the flat bottom surface extending along an extension direction of the housing passageway and being belt-shaped, and the pair of inclined surfaces extending from respective edges of the flat bottom surface away from one another, and the pair of inclined surfaces are positioned such that while the electrode can be housed in the housing passageway with a top end of the electrode being positioned at a bottom surface side of the housing passageway, the electrode juts out and cannot be housed in the housing passageway with a base end of the electrode being positioned at the bottom surface side of the housing passageway.