An outdoor unit for an air-conditioning apparatus, comprising: a housing; an outdoor heat exchanger arranged inside the housing; a fan arranged on a front surface of the outdoor heat exchanger; a motor configured to drive the fan; and a motor fixing support configured to fix the motor, the motor fixing support including: long base sections (24b1, 24b2) extending in a vertical direction and respectively formed on both sides of the motor fixing support in a lateral direction; folding pieces (24c1, 24c2, 24d1, 24d2) respectively extending from both side edges of each of the base sections (24b1, 24b2) in a short-side direction; a plurality of connecting sections (24z1, 24z2, 24z3, 24z4) for connecting the one of the base sections (24b1, 24b2) and the other of the base sections (24b1, 24b2) to each other; and a motor holding section for holding the motor, the motor holding section being provided between two hollow portions (24o1, 24o2), the two hollow portions (24o1, 24o2) being formed between the plurality of connecting sections (24z1, 24z2, 24z3, 24z4), one of the folding pieces (24c1) extending from one of the base sections (24b1) toward an other of the base sections (24b2), an other of the folding pieces (24c2) extending from the other of the base sections (24b2) toward the one of the base sections (24b1, whereby the one and the other of the folding pieces (24c1, 24c2) having lengths in respective extending directions larger than a length in an extending direction of still other at least one of the folding pieces (24d1, 24d2), characterized in that the folding pieces (24c1, 24c2, 24d1, 24d2) respectively extending from both the side edges of the each of the base sections (24b1, 24b2) in the short-side direction are formed below the motor holding section, and extend toward a front surface side of the housing or a rear surface side of the housing under a folded state. a housing; an outdoor heat exchanger arranged inside the housing; a fan arranged on a front surface of the outdoor heat exchanger; a motor configured to drive the fan; and a motor fixing support configured to fix the motor, the motor fixing support including: long base sections (24b1, 24b2) extending in a vertical direction and respectively formed on both sides of the motor fixing support in a lateral direction; folding pieces (24c1, 24c2, 24d1, 24d2) respectively extending from both side edges of each of the base sections (24b1, 24b2) in a short-side direction; a plurality of connecting sections (24z1, 24z2, 24z3, 24z4) for connecting the one of the base sections (24b1, 24b2) and the other of the base sections (24b1, 24b2) to each other; and a motor holding section for holding the motor, the motor holding section being provided between two hollow portions (24o1, 24o2), the two hollow portions (24o1, 24o2) being formed between the plurality of connecting sections (24z1, 24z2, 24z3, 24z4), long base sections (24b1, 24b2) extending in a vertical direction and respectively formed on both sides of the motor fixing support in a lateral direction; folding pieces (24c1, 24c2, 24d1, 24d2) respectively extending from both side edges of each of the base sections (24b1, 24b2) in a short-side direction; a plurality of connecting sections (24z1, 24z2, 24z3, 24z4) for connecting the one of the base sections (24b1, 24b2) and the other of the base sections (24b1, 24b2) to each other; and a motor holding section for holding the motor, the motor holding section being provided between two hollow portions (24o1, 24o2), the two hollow portions (24o1, 24o2) being formed between the plurality of connecting sections (24z1, 24z2, 24z3, 24z4), one of the folding pieces (24c1) extending from one of the base sections (24b1) toward an other of the base sections (24b2), an other of the folding pieces (24c2) extending from the other of the base sections (24b2) toward the one of the base sections (24b1, whereby the one and the other of the folding pieces (24c1, 24c2) having lengths in respective extending directions larger than a length in an extending direction of still other at least one of the folding pieces (24d1, 24d2), characterized in that the folding pieces (24c1, 24c2, 24d1, 24d2) respectively extending from both the side edges of the each of the base sections (24b1, 24b2) in the short-side direction are formed below the motor holding section, and extend toward a front surface side of the housing or a rear surface side of the housing under a folded state.