A propulsion device for a proximity twin-screw vessel having a shaft bracket, the propulsion device comprising: a port propeller and a starboard propeller installed at a stern hull; one rudder disposed at a center in a vessel widthwise direction of the stern hull or two rudders constituted by a port rudder and a starboard rudder in rear of the port propeller and the starboard propeller; and shaft brackets (13L,13R) installed in front of the port propeller and the starboard propeller, respectively, and configured to rotatably support propeller shafts of the port propeller and the starboard propeller, wherein a distance between a tip end of a propeller blade of the port propeller and a tip end of a propeller blade of the starboard propeller at the center in the vessel widthwise direction is larger than 0 m and equal to or smaller than 1.0 m, wherein a rotational direction of the port propeller and the starboard propeller becomes an outer track rotating from the center in the vessel widthwise direction toward the outside over the port propeller and the starboard propeller, wherein, provided that propeller diameters of the port propeller and the starboard propeller are Dp, a distance between a central position (Pc) of the port propeller and the starboard propeller and a front edge of the rudder at a central height (Ph) of the port propeller and the starboard propeller is equal to or less than 1.0 Dp, wherein the shaft bracket (13L,13R) comprises a shaft support section (14L,14R) configured to rotatably support the propeller shafts (12L,12R) of the port propeller and the starboard propeller, and a strut (25L, 25R; 26L, 26R) extending upward from the shaft support section (14L,14R), the strut (25L, 25R; 26L, 26R) configured to connect the shaft support section (14L,14R) and the stern hull, wherein the strut (25L, 25R; 26L, 26R) is formed to provide flows (FL1,FR1) in an opposite direction of the rotational direction of the port propeller and the starboard propeller in upper sections of the port propeller and the starboard propeller, wherein the stern hull is a stern structure of a single screw vessel type, in which a front end section at the same heights as the port propeller and the starboard propeller of the stern hull is disposed closer to the bow side than the positions of the ends of the rotational surface of the port propeller and the starboard propeller near the bow side, wherein the shaft support section (14L,14R) is disposed closer to the stern side than the front end section, and wherein the strut (25L, 25R; 26L, 26R) has the shaft bracket (13L,13R) which is disposed closer to the bow side than the positions of the ends of the rotational surfaces of the port propeller and the starboard propeller near the bow side, closer to the stern side than the front end section, and extending upwardly from the shaft support section (14L,14R) to be connected to the hull. a port propeller and a starboard propeller installed at a stern hull; one rudder disposed at a center in a vessel widthwise direction of the stern hull or two rudders constituted by a port rudder and a starboard rudder in rear of the port propeller and the starboard propeller; and shaft brackets (13L,13R) installed in front of the port propeller and the starboard propeller, respectively, and configured to rotatably support propeller shafts of the port propeller and the starboard propeller, wherein a distance between a tip end of a propeller blade of the port propeller and a tip end of a propeller blade of the starboard propeller at the center in the vessel widthwise direction is larger than 0 m and equal to or smaller than 1.0 m, wherein a rotational direction of the port propeller and the starboard propeller becomes an outer track rotating from the center in the vessel widthwise direction toward the outside over the port propeller and the starboard propeller, wherein, provided that propeller diameters of the port propeller and the starboard propeller are Dp, a distance between a central position (Pc) of the port propeller and the starboard propeller and a front edge of the rudder at a central height (Ph) of the port propeller and the starboard propeller is equal to or less than 1.0 Dp, wherein the shaft bracket (13L,13R) comprises a shaft support section (14L,14R) configured to rotatably support the propeller shafts (12L,12R) of the port propeller and the starboard propeller, and a strut (25L, 25R; 26L, 26R) extending upward from the shaft support section (14L,14R), the strut (25L, 25R; 26L, 26R) configured to connect the shaft support section (14L,14R) and the stern hull, wherein the strut (25L, 25R; 26L, 26R) is formed to provide flows (FL1,FR1) in an opposite direction of the rotational direction of the port propeller and the starboard propeller in upper sections of the port propeller and the starboard propeller, wherein the stern hull is a stern structure of a single screw vessel type, in which a front end section at the same heights as the port propeller and the starboard propeller of the stern hull is disposed closer to the bow side than the positions of the ends of the rotational surface of the port propeller and the starboard propeller near the bow side, wherein the shaft support section (14L,14R) is disposed closer to the stern side than the front end section, and wherein the strut (25L, 25R; 26L, 26R) has the shaft bracket (13L,13R) which is disposed closer to the bow side than the positions of the ends of the rotational surfaces of the port propeller and the starboard propeller near the bow side, closer to the stern side than the front end section, and extending upwardly from the shaft support section (14L,14R) to be connected to the hull.