An oven comprising: a cooking chamber for cooking food; a machine chamber accommodating electronic components; a housing disposed inside the machine chamber, the housing comprising an upper bracket and a lower bracket coupled one on top of the other to form a space between them in which fluid can flow, wherein the upper bracket and the lower bracket are inclined in directions facing each other; a cooling fan coupled to one end of the housing to suck fluid from outside the housing and blow the sucked fluid to an inside of the housing; a fluid passage guide having a first branch forming a first fluid passage, a second branch connected to the first branch and forming a second fluid passage, and a third branch connected to the second branch and forming a third fluid passage, the fluid passage guide being disposed between the cooking chamber and the housing, the fluid passage guide having an opening provided at the end of the first branch and being in fluid communication with the cooking chamber to draw fluid from the cooking chamber into the first fluid passage, wherein the second branch comprises a terminal provided at its end; and a plurality of communication holes (131, 132) formed through one surface of the housing such that the housing communicates with the fluid passage guide in at least two different positions, wherein the plurality of communication holes comprise: a first communication hole in fluid communication with the terminal, disposed in the surface of the housing and arranged to guide fluid from the second fluid passage so as to be discharged to an inside of the housing; and a second communication hole disposed in the surface of the housing and arranged to guide fluid of the inside of the housing so as to be introduced to the third fluid passage, wherein the first branch passes through an upper frame of the cooking chamber and a lower frame of the machine chamber, and wherein the second branch and third branch are coupled to the lower surface of the lower bracket. a cooking chamber for cooking food; a machine chamber accommodating electronic components; a housing disposed inside the machine chamber, the housing comprising an upper bracket and a lower bracket coupled one on top of the other to form a space between them in which fluid can flow, wherein the upper bracket and the lower bracket are inclined in directions facing each other; a cooling fan coupled to one end of the housing to suck fluid from outside the housing and blow the sucked fluid to an inside of the housing; a fluid passage guide having a first branch forming a first fluid passage, a second branch connected to the first branch and forming a second fluid passage, and a third branch connected to the second branch and forming a third fluid passage, the fluid passage guide being disposed between the cooking chamber and the housing, the fluid passage guide having an opening provided at the end of the first branch and being in fluid communication with the cooking chamber to draw fluid from the cooking chamber into the first fluid passage, wherein the second branch comprises a terminal provided at its end; and a plurality of communication holes (131, 132) formed through one surface of the housing such that the housing communicates with the fluid passage guide in at least two different positions, wherein the plurality of communication holes comprise: a first communication hole in fluid communication with the terminal, disposed in the surface of the housing and arranged to guide fluid from the second fluid passage so as to be discharged to an inside of the housing; and a second communication hole disposed in the surface of the housing and arranged to guide fluid of the inside of the housing so as to be introduced to the third fluid passage, wherein the first branch passes through an upper frame of the cooking chamber and a lower frame of the machine chamber, and wherein the second branch and third branch are coupled to the lower surface of the lower bracket. a first communication hole in fluid communication with the terminal, disposed in the surface of the housing and arranged to guide fluid from the second fluid passage so as to be discharged to an inside of the housing; and a second communication hole disposed in the surface of the housing and arranged to guide fluid of the inside of the housing so as to be introduced to the third fluid passage, wherein the first branch passes through an upper frame of the cooking chamber and a lower frame of the machine chamber, and wherein the second branch and third branch are coupled to the lower surface of the lower bracket.