A refrigeration cycle device comprising: a casing that configures an outer contour of an outdoor machine , has a first chamber (M) and a second chamber (F) formed therewithin, and has formed an introduction hole for introducing outside air into the first chamber (M); a partition that partitions the interior of the casing so as to demarcate the first chamber (M) and the second chamber (F); a refrigeration cycle circuit , of which at least a portion is disposed in the first chamber (M), and through which a combustible refrigerant circulates; a blower disposed in the second chamber (F) that sends out the outside air introduced from the introduction hole through a blow-through hole and outside the casing from a blow-out opening formed in the second chamber (F); and a controller that includes a plurality of electronic components used to control the refrigeration cycle circuit and the blower , and an electronic component housing that houses the electronic components; wherein the electronic component housing is disposed in a top part inside the first chamber (M), and the introduction hole is formed at a position lower than the electronic component housing ; a height of a top edge of the introduction hole is the same height as a height of a bottom edge of the electronic component housing ; characterized in that the partition has formed in a bottom part thereof the blow-through hole connecting from the first chamber (M) to the second chamber (F); wherein a tubular bell mouth is attached on an inner side of the blow-out opening , and the blow-through hole is covered by the bell mouth so as to not be exposed from the blow-out opening . a casing that configures an outer contour of an outdoor machine , has a first chamber (M) and a second chamber (F) formed therewithin, and has formed an introduction hole for introducing outside air into the first chamber (M); a partition that partitions the interior of the casing so as to demarcate the first chamber (M) and the second chamber (F); a refrigeration cycle circuit , of which at least a portion is disposed in the first chamber (M), and through which a combustible refrigerant circulates; a blower disposed in the second chamber (F) that sends out the outside air introduced from the introduction hole through a blow-through hole and outside the casing from a blow-out opening formed in the second chamber (F); and a controller that includes a plurality of electronic components used to control the refrigeration cycle circuit and the blower , and an electronic component housing that houses the electronic components; wherein the electronic component housing is disposed in a top part inside the first chamber (M), and the introduction hole is formed at a position lower than the electronic component housing ; a height of a top edge of the introduction hole is the same height as a height of a bottom edge of the electronic component housing ; characterized in that the partition has formed in a bottom part thereof the blow-through hole connecting from the first chamber (M) to the second chamber (F); wherein a tubular bell mouth is attached on an inner side of the blow-out opening , and the blow-through hole is covered by the bell mouth so as to not be exposed from the blow-out opening . <EOS>