A blower that generates air flow, the blower comprising: an impeller that is configured to rotate on a shaft extending laterally and has therein a space to which air sucked through a side is introduced; a scroll housing that has a space for accommodating the impeller and has a suction hole formed on a side via which outside air is introduced into the space, wherein the scroll housing is formed in a laid cylindrical shape with sides opened; a mounting portion provided on a side of the scroll housing where the suction hole is formed, wherein the mounting portion comprises a plurality of support members arranged along a circumference of the scroll housing, spaced apart from one another at a spacing; and a driving unit that is coupled with the mounting portion to be installed outside the scroll housing without being inserted into the impeller, wherein the driving unit is installed spaced apart from the outer circumferential surface of the scroll housing so that a passage connecting the suction hole to outside of the blower is formed between the driving unit and the scroll housing; wherein the driving unit is configured such that a rotor and a stator are mounted in a motor case and a shaft connects between the impeller and the rotor; wherein the motor case includes a case body for accommodating the rotor and the stator therein, and coupling parts for coupling the case body to the mounting portion; and wherein each of the support members has a length extending from an outer circumferential surface of the scroll housing toward a center of the suction hole and wherein the driving unit is coupled with the plurality of support members at a position closer to the center of the suction hole from the outer circumferential surface of the scroll housing; wherein the motor case is formed in a flat hexagonal shape, wherein the case body is formed in a flat cylindrical shape disposed at a center of the motor case, wherein the coupling parts are formed on corners of the motor case so that the coupling parts are disposed on an outer side of the case body; and wherein the corners of the motor case formed by the coupling parts have a length in the width direction shorter than a center portion of the motor case formed by the case body. an impeller that is configured to rotate on a shaft extending laterally and has therein a space to which air sucked through a side is introduced; a scroll housing that has a space for accommodating the impeller and has a suction hole formed on a side via which outside air is introduced into the space, wherein the scroll housing is formed in a laid cylindrical shape with sides opened; a mounting portion provided on a side of the scroll housing where the suction hole is formed, wherein the mounting portion comprises a plurality of support members arranged along a circumference of the scroll housing, spaced apart from one another at a spacing; and a driving unit that is coupled with the mounting portion to be installed outside the scroll housing without being inserted into the impeller, wherein the driving unit is installed spaced apart from the outer circumferential surface of the scroll housing so that a passage connecting the suction hole to outside of the blower is formed between the driving unit and the scroll housing; wherein the driving unit is configured such that a rotor and a stator are mounted in a motor case and a shaft connects between the impeller and the rotor; wherein the motor case includes a case body for accommodating the rotor and the stator therein, and coupling parts for coupling the case body to the mounting portion; and wherein each of the support members has a length extending from an outer circumferential surface of the scroll housing toward a center of the suction hole and wherein the driving unit is coupled with the plurality of support members at a position closer to the center of the suction hole from the outer circumferential surface of the scroll housing; wherein the motor case is formed in a flat hexagonal shape, wherein the case body is formed in a flat cylindrical shape disposed at a center of the motor case, wherein the coupling parts are formed on corners of the motor case so that the coupling parts are disposed on an outer side of the case body; and wherein the corners of the motor case formed by the coupling parts have a length in the width direction shorter than a center portion of the motor case formed by the case body.