A rotating electrical machine case which accommodates a rotating electrical machine, the rotating electrical machine case comprising: a cylindrical pot-shaped case body surrounding the rotating electrical machine and; a side wall portion integrally provided on at least one end side of the case body in a rotation axis direction; and a rotation shaft support portion having a cylindrical shape extending in a direction away from the side wall portion along the rotation axis direction wherein: the side wall portion is provided with a plurality of ribs extending in a radial direction when viewed from the rotation axis direction; and the plurality of ribs include ribs having a radial orientation and different circumferential widths and are arranged as rigidity reinforcing elements of the rotation shaft support portion characterized in that the ribs protrude to the outside of the side wall portion of the case body, wherein electrical machine specification information is displayed on the front side of a rib of the plurality of ribs, which is wider in the circumferential width than the other ribs, the rib on which the information is displayed has an inclined surface which extends radially inward as the rib is separated from the side wall portion along the rotation axis direction and is connected to the shaft support portion; and the information is displayed on the inclined surface, the information is engraved or sticked on the rib. a cylindrical pot-shaped case body surrounding the rotating electrical machine and; a side wall portion integrally provided on at least one end side of the case body in a rotation axis direction; and a rotation shaft support portion having a cylindrical shape extending in a direction away from the side wall portion along the rotation axis direction wherein: the side wall portion is provided with a plurality of ribs extending in a radial direction when viewed from the rotation axis direction; and the plurality of ribs include ribs having a radial orientation and different circumferential widths and are arranged as rigidity reinforcing elements of the rotation shaft support portion characterized in that the ribs protrude to the outside of the side wall portion of the case body, wherein electrical machine specification information is displayed on the front side of a rib of the plurality of ribs, which is wider in the circumferential width than the other ribs, the rib on which the information is displayed has an inclined surface which extends radially inward as the rib is separated from the side wall portion along the rotation axis direction and is connected to the shaft support portion; and the information is displayed on the inclined surface, the information is engraved or sticked on the rib. the side wall portion is provided with a plurality of ribs extending in a radial direction when viewed from the rotation axis direction; and the plurality of ribs include ribs having a radial orientation and different circumferential widths and are arranged as rigidity reinforcing elements of the rotation shaft support portion characterized in that the ribs protrude to the outside of the side wall portion of the case body, wherein electrical machine specification information is displayed on the front side of a rib of the plurality of ribs, which is wider in the circumferential width than the other ribs, the rib on which the information is displayed has an inclined surface which extends radially inward as the rib is separated from the side wall portion along the rotation axis direction and is connected to the shaft support portion; and the information is displayed on the inclined surface, the information is engraved or sticked on the rib.