An outdoor unit to which a refrigerant pipe, used to circulate refrigerant between an indoor unit and the outdoor unit, is connected, the outdoor unit comprising: a compressor; an outdoor heat exchanger; a rectangular bottom panel disposed below the compressor and the outdoor heat exchanger, the rectangular bottom panel supporting the compressor and the outdoor heat exchanger; a peripheral panel (1B, 1C, 1CC) disposed on a peripheral portion (1E1) of the bottom panel and positioned upright on the bottom panel; a fixing panel disposed at a corner portion of the bottom panel to be located at an inner side of the peripheral panel (1B, 1C, 1CC), and positioned upright on the bottom panel; and a valve which is fixed to the fixing panel and to which the refrigerant pipe is connected, and a cover disposed on the peripheral portion (1E1) of the bottom panel and provided at a position opposed to the fixing panel to cover the valve, wherein the cover has a lead out section (1D3) formed to lead out the refrigerant pipe connected to the valve, wherein the peripheral panel (1B, 1C, 1CC) includes: a side panel (1C, 1CC) provided on the peripheral portion (1E1) of the bottom panel and to which the cover is attached; and a front panel having a side end portion at which the side panel (1C, 1CC) is provided and the cover is attached, the front panel being disposed on the peripheral portion (1E1) of the bottom panel, and characterized in that an end portion of the outdoor heat exchanger is opposed to one side end portion of the side panel (1C, 1CC), the bottom panel includes a first projection portion formed at a portion thereof corresponding to the end portion of the outdoor heat exchanger, the first projection portion projecting horizontally, the first projection portion has, at an edge thereof, a tapered-shaped surface extending toward a portion, located below the valve, of the bottom panel, and the side panel (1C, 1CC) extends along the edge portion of the first projection portion. a compressor; an outdoor heat exchanger; a rectangular bottom panel disposed below the compressor and the outdoor heat exchanger, the rectangular bottom panel supporting the compressor and the outdoor heat exchanger; a peripheral panel (1B, 1C, 1CC) disposed on a peripheral portion (1E1) of the bottom panel and positioned upright on the bottom panel; a fixing panel disposed at a corner portion of the bottom panel to be located at an inner side of the peripheral panel (1B, 1C, 1CC), and positioned upright on the bottom panel; and a valve which is fixed to the fixing panel and to which the refrigerant pipe is connected, and a cover disposed on the peripheral portion (1E1) of the bottom panel and provided at a position opposed to the fixing panel to cover the valve, wherein the cover has a lead out section (1D3) formed to lead out the refrigerant pipe connected to the valve, wherein the peripheral panel (1B, 1C, 1CC) includes: a side panel (1C, 1CC) provided on the peripheral portion (1E1) of the bottom panel and to which the cover is attached; and a front panel having a side end portion at which the side panel (1C, 1CC) is provided and the cover is attached, the front panel being disposed on the peripheral portion (1E1) of the bottom panel, and characterized in that an end portion of the outdoor heat exchanger is opposed to one side end portion of the side panel (1C, 1CC), the bottom panel includes a first projection portion formed at a portion thereof corresponding to the end portion of the outdoor heat exchanger, the first projection portion projecting horizontally, the first projection portion has, at an edge thereof, a tapered-shaped surface extending toward a portion, located below the valve, of the bottom panel, and the side panel (1C, 1CC) extends along the edge portion of the first projection portion. a side panel (1C, 1CC) provided on the peripheral portion (1E1) of the bottom panel and to which the cover is attached; and a front panel having a side end portion at which the side panel (1C, 1CC) is provided and the cover is attached, the front panel being disposed on the peripheral portion (1E1) of the bottom panel, and characterized in that an end portion of the outdoor heat exchanger is opposed to one side end portion of the side panel (1C, 1CC), the bottom panel includes a first projection portion formed at a portion thereof corresponding to the end portion of the outdoor heat exchanger, the first projection portion projecting horizontally, the first projection portion has, at an edge thereof, a tapered-shaped surface extending toward a portion, located below the valve, of the bottom panel, and the side panel (1C, 1CC) extends along the edge portion of the first projection portion.