A fluid mixing output apparatus (S, 1100, 2100, 3100) comprising: a housing ; and an internal structure accommodated in the housing , wherein the housing is provided with a plurality of fluid supply ports (111-1, 111-2, 211-1, 211-2a~211-2c, 213-I, 311-2a~311-2d, 313-I) for supplying at least a first fluid and a second fluid and a fluid outlet (112, 212-0, 312-0) at its downstream end for outputting a plurality of fluids after mixing the plurality of fluids, and the internal structure comprises a first portion , a second portion , a third portion , and a fourth portion , wherein the first portion comprises a shaft portion and a vane spirally formed to generate a swirling flow in a fluid, the second portion is located downstream from the first portion , and comprises a shaft portion and a plurality of protrusions protruding from an outer circumferential surface of the shaft portion, the third portion is located downstream from the second portion , and comprises a shaft portion and a vane spirally formed to generate a swirling flow in a fluid, and the fourth portion is located downstream from the third portion , and comprises a shaft portion and a plurality of protrusions protruding from an outer circumferential surface of the shaft portion, and characterized in that one of the plurality of fluid supply ports of the housing is formed by opening an upstream end (213-I, 313-I) and/or in a portion corresponding to the vane of the first portion (111-1, 211-1, 211-1), and at least the first fluid is supplied to the first portion and supplied to the second portion as a swirling flow, and that one of the plurality of fluid supply ports (211-2a-211-2c, 311-2a-311-2d) of the housing is formed in a portion corresponding to the vane of the third portion , and the second fluid is supplied to the third portion and supplied to the fourth portion as a swirling flow while being mixed with at least the first fluid. a housing ; and an internal structure accommodated in the housing , wherein the housing is provided with a plurality of fluid supply ports (111-1, 111-2, 211-1, 211-2a~211-2c, 213-I, 311-2a~311-2d, 313-I) for supplying at least a first fluid and a second fluid and a fluid outlet (112, 212-0, 312-0) at its downstream end for outputting a plurality of fluids after mixing the plurality of fluids, and the internal structure comprises a first portion , a second portion , a third portion , and a fourth portion , wherein the first portion comprises a shaft portion and a vane spirally formed to generate a swirling flow in a fluid, the second portion is located downstream from the first portion , and comprises a shaft portion and a plurality of protrusions protruding from an outer circumferential surface of the shaft portion, the third portion is located downstream from the second portion , and comprises a shaft portion and a vane spirally formed to generate a swirling flow in a fluid, and the fourth portion is located downstream from the third portion , and comprises a shaft portion and a plurality of protrusions protruding from an outer circumferential surface of the shaft portion, and characterized in that one of the plurality of fluid supply ports of the housing is formed by opening an upstream end (213-I, 313-I) and/or in a portion corresponding to the vane of the first portion (111-1, 211-1, 211-1), and at least the first fluid is supplied to the first portion and supplied to the second portion as a swirling flow, and that one of the plurality of fluid supply ports (211-2a-211-2c, 311-2a-311-2d) of the housing is formed in a portion corresponding to the vane of the third portion , and the second fluid is supplied to the third portion and supplied to the fourth portion as a swirling flow while being mixed with at least the first fluid. <EOS>