A direct-current motor comprising: a rotor having a rotation shaft; a stator surrounding the rotor; and a motor case which accommodates the stator and retains the stator, the motor case including a first case and a second case separable from each other in a direction of an axis of the rotation shaft of the rotor, the first case and the second case each having a separation edge (34, 38) extending around the stator; characterized in that the first case and the second case each have cut-away portions (35, 39) provided at angular positions circumferentially generally equidistantly spaced from each other and each extending parallel to the axis from the separation edge; wherein the separation edge of the first case and the separation edge of the second case each have abutment portions (34A, 38A) not formed with the cut-away portions, the abutment portions of the first case respectively abutting against the abutment portions of the second case; wherein the cut-away portions of the first case and the cut-away portions of the second case cooperatively define a plurality of windows which are disposed in a periphery of the motor case in circumferentially generally equidistantly spaced relation; wherein the stator has a plurality of bulges projecting radially outward from a peripheral surface thereof in association with the windows; wherein the bulges are respectively fitted in the cut-away portions of the first case and in the cut-away portions of the second case; wherein the bulges each have a fixing screw hole extending parallel to the axis for fixing the stator to the first case; wherein the first case has screw holes which are threadingly engaged with distal end portions of screws inserted through the fixing screw holes of the bulges. a rotor having a rotation shaft; a stator surrounding the rotor; and a motor case which accommodates the stator and retains the stator, the motor case including a first case and a second case separable from each other in a direction of an axis of the rotation shaft of the rotor, the first case and the second case each having a separation edge (34, 38) extending around the stator; characterized in that the first case and the second case each have cut-away portions (35, 39) provided at angular positions circumferentially generally equidistantly spaced from each other and each extending parallel to the axis from the separation edge; wherein the separation edge of the first case and the separation edge of the second case each have abutment portions (34A, 38A) not formed with the cut-away portions, the abutment portions of the first case respectively abutting against the abutment portions of the second case; wherein the cut-away portions of the first case and the cut-away portions of the second case cooperatively define a plurality of windows which are disposed in a periphery of the motor case in circumferentially generally equidistantly spaced relation; wherein the stator has a plurality of bulges projecting radially outward from a peripheral surface thereof in association with the windows; wherein the bulges are respectively fitted in the cut-away portions of the first case and in the cut-away portions of the second case; wherein the bulges each have a fixing screw hole extending parallel to the axis for fixing the stator to the first case; wherein the first case has screw holes which are threadingly engaged with distal end portions of screws inserted through the fixing screw holes of the bulges.