An outdoor device of an air conditioner, comprising: a top cover that forms an upper surface of the outdoor device and in which a plurality of discharge ports is formed; a base pan that forms a lower surface of the outdoor device; an outdoor heat exchanger that extends along a periphery of the base pan; a plurality of side supporters that connects the top cover and the base pan and forms corners of the outdoor device; and a plurality of outer panels provided between the plurality of side supporters and coupled to the plurality of side supporters to form a shape of an outer periphery of the outdoor device, wherein a plurality of suction ports (311, 331, 371), through which outside air is suctioned, is formed in a region of the plurality of outer panels corresponding to the outdoor heat exchanger, and wherein each of the plurality of side supporters includes an inclined surface forming a surface inclined between outer surfaces of neighboring ones of the plurality of outer panels, and a pair of extending surfaces formed at both side ends of the inclined surface and bent multiple times, wherein each of the extending surfaces includes a first side surface bent at the respective side end of the inclined surface and coplanar with an outer surface of the respective outer panel, a second side surface bent from the first side surface toward an inside of the outdoor device and then extended, and a coupling portion bent from the second side surface toward the outside and coupled to the respective outer panel, and wherein each of the plurality of outer panels includes a coupling portion (312, 321, 341) bent and coupled to the side supporter, the coupling portion (312,321,341) being bent toward the inside of the outdoor device and then further bent toward the outside from an extending end of the outdoor heat exchanger and coupled to the coupling portion, characterized in that vertical grooves spaced apart from each other are formed between an outer surface of each of the pair of extending surfaces and an outer surface of the corresponding outer panel connected to said side supporter, so that a user may put his or her hand into the vertical grooves when the outdoor device is transported or installed. a top cover that forms an upper surface of the outdoor device and in which a plurality of discharge ports is formed; a base pan that forms a lower surface of the outdoor device; an outdoor heat exchanger that extends along a periphery of the base pan; a plurality of side supporters that connects the top cover and the base pan and forms corners of the outdoor device; and a plurality of outer panels provided between the plurality of side supporters and coupled to the plurality of side supporters to form a shape of an outer periphery of the outdoor device, wherein a plurality of suction ports (311, 331, 371), through which outside air is suctioned, is formed in a region of the plurality of outer panels corresponding to the outdoor heat exchanger, and wherein each of the plurality of side supporters includes an inclined surface forming a surface inclined between outer surfaces of neighboring ones of the plurality of outer panels, and a pair of extending surfaces formed at both side ends of the inclined surface and bent multiple times, wherein each of the extending surfaces includes a first side surface bent at the respective side end of the inclined surface and coplanar with an outer surface of the respective outer panel, a second side surface bent from the first side surface toward an inside of the outdoor device and then extended, and a coupling portion bent from the second side surface toward the outside and coupled to the respective outer panel, and wherein each of the plurality of outer panels includes a coupling portion (312, 321, 341) bent and coupled to the side supporter, the coupling portion (312,321,341) being bent toward the inside of the outdoor device and then further bent toward the outside from an extending end of the outdoor heat exchanger and coupled to the coupling portion, characterized in that vertical grooves spaced apart from each other are formed between an outer surface of each of the pair of extending surfaces and an outer surface of the corresponding outer panel connected to said side supporter, so that a user may put his or her hand into the vertical grooves when the outdoor device is transported or installed.