An armature comprising: an armature core; first-, second-, and third-phase armature windings (30U, 30V, 30W) wound at least around the armature core; and a busbar unit that comprises: at least first-, second-, and third-phase busbars (40U, 40V, 40W) electrically connected to the respective first-, second-, and third-phase armature windings (30U, 30V, 30W), the first-phase busbar serving as a lowermost busbar located to face the armature core in the axial direction, the second-phase busbar serving as an intermediate busbar stacked over the lowermost busbar in the axial direction, the third-phase busbar serving as an uppermost busbar stacked over the intermediate busbar in the axial direction, so that the lowermost busbar, intermediate busbar, and uppermost busbar are stacked in the axial direction; and a resin member that covers the lowermost busbar, intermediate busbar, and uppermost busbar stacked in the axial direction, so that the lowermost busbar, intermediate busbar, and uppermost busbar are integrated to constitute a busbar stack; and a protrusion member mounted to the intermediate busbar and protruding radially outward from the intermediate busbar, at least part of the protrusion member being located to be nonoverlapped with the uppermost busbar and the lowermost busbar in the axial direction, wherein: the intermediate busbar comprises a resin-covered intermediate busbar covered with a first resin; a support member is used to support at least one part of the intermediate busbar in covering of the intermediate busbar with the first resin, resulting in the at least part of the protrusion member being an exposed part that is non-covered with the first resin; the exposed part of the protrusion member is radially offset with respect to the uppermost busbar and the lowermost busbar, resulting in the exposed part of the protrusion member having a radially sufficient distance with respect to the uppermost and lowermost busbars; and the uppermost busbar, the resin-covered intermediate busbar, and the lowermost busbar stacked in the axial direction is covered with a second resin that is the resin member, resulting in the busbar stack being constituted. an armature core; first-, second-, and third-phase armature windings (30U, 30V, 30W) wound at least around the armature core; and a busbar unit that comprises: at least first-, second-, and third-phase busbars (40U, 40V, 40W) electrically connected to the respective first-, second-, and third-phase armature windings (30U, 30V, 30W), the first-phase busbar serving as a lowermost busbar located to face the armature core in the axial direction, the second-phase busbar serving as an intermediate busbar stacked over the lowermost busbar in the axial direction, the third-phase busbar serving as an uppermost busbar stacked over the intermediate busbar in the axial direction, so that the lowermost busbar, intermediate busbar, and uppermost busbar are stacked in the axial direction; and a resin member that covers the lowermost busbar, intermediate busbar, and uppermost busbar stacked in the axial direction, so that the lowermost busbar, intermediate busbar, and uppermost busbar are integrated to constitute a busbar stack; and a protrusion member mounted to the intermediate busbar and protruding radially outward from the intermediate busbar, at least part of the protrusion member being located to be nonoverlapped with the uppermost busbar and the lowermost busbar in the axial direction, wherein: the intermediate busbar comprises a resin-covered intermediate busbar covered with a first resin; a support member is used to support at least one part of the intermediate busbar in covering of the intermediate busbar with the first resin, resulting in the at least part of the protrusion member being an exposed part that is non-covered with the first resin; the exposed part of the protrusion member is radially offset with respect to the uppermost busbar and the lowermost busbar, resulting in the exposed part of the protrusion member having a radially sufficient distance with respect to the uppermost and lowermost busbars; and the uppermost busbar, the resin-covered intermediate busbar, and the lowermost busbar stacked in the axial direction is covered with a second resin that is the resin member, resulting in the busbar stack being constituted. the intermediate busbar comprises a resin-covered intermediate busbar covered with a first resin; a support member is used to support at least one part of the intermediate busbar in covering of the intermediate busbar with the first resin, resulting in the at least part of the protrusion member being an exposed part that is non-covered with the first resin; the exposed part of the protrusion member is radially offset with respect to the uppermost busbar and the lowermost busbar, resulting in the exposed part of the protrusion member having a radially sufficient distance with respect to the uppermost and lowermost busbars; and the uppermost busbar, the resin-covered intermediate busbar, and the lowermost busbar stacked in the axial direction is covered with a second resin that is the resin member, resulting in the busbar stack being constituted.