An outdoor unit capable of promptly discharging dew condensation water dropped from a heat exchanger to an exterior is provided. A drainage port is formed in a bottom frame of an outdoor unit below a heat exchanger. A base leg of the bottom frame is formed to have a U shape section by upper plates abutted with a lower surface of the bottom frame, lower plates fixed to an installment surface, and standing plates connecting the upper plates and the lower plates, and further includes a first part and a second part with respect to the longitudinal direction. The first part is formed to have a U shape section opening outward in the horizontal direction with the lower plate thereof being fixed to the installment surface. The second part is provided at least at a position corresponding to the drainage port with respect to the longitudinal direction of the base leg, and formed to have a U shape section opening inward in the horizontal direction, the second part having a structure where the upper plate thereof avoids a lower region of the drainage port.