An acoustic space building structure installed on a base bottom face and having an open top, wherein the acoustic space building structure has one point on the base bottom face as a center point in a plan view thereof, wherein the acoustic space building structure comprises: a plurality of sound guide blade plates standing upright on the base bottom face and spaced from each other by a predefined spacing, wherein the plurality of sound guide blade plates extend radially toward the center point on the base bottom face and are spaced from the center point and are arranged in a curved frame shape in the plan view of the building structure; a sound reflective wall standing upright on the base bottom face and connected to the sound guide blade plates, wherein the sound reflective wall extends in a curved shape identical with the curved frame shape in the plan view of the building structure, wherein an acoustic space is defined so as to be surrounded with an inner side face of the sound reflective wall; and a rooftop viewing floor vertically spaced apart from the base bottom face by a predefined vertical dimension, wherein rooftop viewing floor extends from an outer side face of an upper portion of the sound reflective wall in a direction away from the center point in the plan view of the base bottom face, wherein each of the sound guide blade plates is a columnar member extending vertically and having a cross-sectional shape having a long side and a short side, wherein each of the sound guide blade plates has the long side extending radially toward the center point in the plan view of the base bottom face, wherein an entirety or a portion of a cross section of each of the sound guide blade plates protrudes, by a predefined length, from an inner side face of the sound reflective wall in a direction toward the center point in the plan view. wherein the acoustic space building structure has one point on the base bottom face as a center point in a plan view thereof, wherein the acoustic space building structure comprises: a plurality of sound guide blade plates standing upright on the base bottom face and spaced from each other by a predefined spacing, wherein the plurality of sound guide blade plates extend radially toward the center point on the base bottom face and are spaced from the center point and are arranged in a curved frame shape in the plan view of the building structure; a sound reflective wall standing upright on the base bottom face and connected to the sound guide blade plates, wherein the sound reflective wall extends in a curved shape identical with the curved frame shape in the plan view of the building structure, wherein an acoustic space is defined so as to be surrounded with an inner side face of the sound reflective wall; and a rooftop viewing floor vertically spaced apart from the base bottom face by a predefined vertical dimension, wherein rooftop viewing floor extends from an outer side face of an upper portion of the sound reflective wall in a direction away from the center point in the plan view of the base bottom face, wherein each of the sound guide blade plates is a columnar member extending vertically and having a cross-sectional shape having a long side and a short side, wherein each of the sound guide blade plates has the long side extending radially toward the center point in the plan view of the base bottom face, wherein an entirety or a portion of a cross section of each of the sound guide blade plates protrudes, by a predefined length, from an inner side face of the sound reflective wall in a direction toward the center point in the plan view. a plurality of sound guide blade plates standing upright on the base bottom face and spaced from each other by a predefined spacing, wherein the plurality of sound guide blade plates extend radially toward the center point on the base bottom face and are spaced from the center point and are arranged in a curved frame shape in the plan view of the building structure; a sound reflective wall standing upright on the base bottom face and connected to the sound guide blade plates, wherein the sound reflective wall extends in a curved shape identical with the curved frame shape in the plan view of the building structure, wherein an acoustic space is defined so as to be surrounded with an inner side face of the sound reflective wall; and a rooftop viewing floor vertically spaced apart from the base bottom face by a predefined vertical dimension, wherein rooftop viewing floor extends from an outer side face of an upper portion of the sound reflective wall in a direction away from the center point in the plan view of the base bottom face, wherein each of the sound guide blade plates is a columnar member extending vertically and having a cross-sectional shape having a long side and a short side, wherein each of the sound guide blade plates has the long side extending radially toward the center point in the plan view of the base bottom face, wherein an entirety or a portion of a cross section of each of the sound guide blade plates protrudes, by a predefined length, from an inner side face of the sound reflective wall in a direction toward the center point in the plan view.