An outdoor unit comprising: a refrigerant pipe for the circulation of a refrigerant; a housing that houses the refrigerant pipe , wherein the housing includes an upper panel , a front panel , a right side panel , a left side panel , a back panel , and a bottom panel ; a sound-proof box that is housed in the housing and surrounds a compressor being configured to cause the refrigerant to be circulated; a connection valve connected to an end of the refrigerant pipe and an external pipe; and a valve bed that fixes the connection valve , characterized in that the right side panel is divided into a front side part of the right side panel connected to the front panel and a back side part of the right side panel ; a part of the right side of the front panel and the front side part of the right side panel constitute a service panel that is detachable; the valve bed having one end fixed to an inner surface of the back side part of the right side panel of the housing and the other end fixed to a side plate of the sound-proof box that is closer to the right side panel to which the one end of the valve bed is fixed than is another one of the side plates , wherein a front surface plate and an upper surface plate of the sound-proof box is detachable, wherein detachment of the service panel allows for detachment of the upper surface plate and the front surface plate of the sound-proof box and in the detached state of the front surface plate and the upper surface plate the other end remains fixed to the right side plate of the sound-proof box, wherein the front panel includes a blowing grille for sucking air into the heat pump outdoor unit wherein holes are formed at a lower part of the front panel for insertion of an extension pipe. a refrigerant pipe for the circulation of a refrigerant; a housing that houses the refrigerant pipe , wherein the housing includes an upper panel , a front panel , a right side panel , a left side panel , a back panel , and a bottom panel ; a sound-proof box that is housed in the housing and surrounds a compressor being configured to cause the refrigerant to be circulated; a connection valve connected to an end of the refrigerant pipe and an external pipe; and a valve bed that fixes the connection valve , characterized in that the right side panel is divided into a front side part of the right side panel connected to the front panel and a back side part of the right side panel ; a part of the right side of the front panel and the front side part of the right side panel constitute a service panel that is detachable; the valve bed having one end fixed to an inner surface of the back side part of the right side panel of the housing and the other end fixed to a side plate of the sound-proof box that is closer to the right side panel to which the one end of the valve bed is fixed than is another one of the side plates , wherein a front surface plate and an upper surface plate of the sound-proof box is detachable, wherein detachment of the service panel allows for detachment of the upper surface plate and the front surface plate of the sound-proof box and in the detached state of the front surface plate and the upper surface plate the other end remains fixed to the right side plate of the sound-proof box, wherein the front panel includes a blowing grille for sucking air into the heat pump outdoor unit wherein holes are formed at a lower part of the front panel for insertion of an extension pipe. <EOS>