An upper rotating body for a construction machine, comprising: a center section having a plurality of lateral plates that are disposed to face one another in a left-right direction and extend in a front-rear direction, wherein an internal space is formed between the plurality of lateral plates; a noise source-housing guard disposed at a right side or a left side of the center section and housing a noise source (21, 22); a cab disposed at a front side or a rear side of the noise source-housing guard; and a propagation part propagating sound generated by the noise source (21, 22) from an inside of the noise source-housing guard to the internal space of the center section, wherein the propagation part includes: a first emitting opening part opened in the noise source-housing guard, wherein the first emitting opening part allows the sound to be emitted from the inside of the noise source-housing guard through the first emitting opening part; and a first receiving opening part opened in the center section, wherein the first receiving opening part allows the sound emitted through the first emitting opening part to be received in the internal space through the first receiving opening part, characterized in that the first emitting opening part is opened and located in the noise source-housing guard between the noise source (21, 22) and the cab in the front-rear direction, and the first receiving opening part is opened and located in the center section between the noise source (21, 22) and the cab in the front-rear direction, and receives the sound emitted through the first emitting opening part. a center section having a plurality of lateral plates that are disposed to face one another in a left-right direction and extend in a front-rear direction, wherein an internal space is formed between the plurality of lateral plates; a noise source-housing guard disposed at a right side or a left side of the center section and housing a noise source (21, 22); a cab disposed at a front side or a rear side of the noise source-housing guard; and a propagation part propagating sound generated by the noise source (21, 22) from an inside of the noise source-housing guard to the internal space of the center section, wherein the propagation part includes: a first emitting opening part opened in the noise source-housing guard, wherein the first emitting opening part allows the sound to be emitted from the inside of the noise source-housing guard through the first emitting opening part; and a first receiving opening part opened in the center section, wherein the first receiving opening part allows the sound emitted through the first emitting opening part to be received in the internal space through the first receiving opening part, characterized in that the first emitting opening part is opened and located in the noise source-housing guard between the noise source (21, 22) and the cab in the front-rear direction, and the first receiving opening part is opened and located in the center section between the noise source (21, 22) and the cab in the front-rear direction, and receives the sound emitted through the first emitting opening part. a first emitting opening part opened in the noise source-housing guard, wherein the first emitting opening part allows the sound to be emitted from the inside of the noise source-housing guard through the first emitting opening part; and a first receiving opening part opened in the center section, wherein the first receiving opening part allows the sound emitted through the first emitting opening part to be received in the internal space through the first receiving opening part, characterized in that the first emitting opening part is opened and located in the noise source-housing guard between the noise source (21, 22) and the cab in the front-rear direction, and the first receiving opening part is opened and located in the center section between the noise source (21, 22) and the cab in the front-rear direction, and receives the sound emitted through the first emitting opening part.