A combustion burner comprising: a fuel nozzle (51;111) that is arranged to blow a fuel gas obtained by mixing solid fuel with air; a secondary air nozzle (52;112) that is arranged to blow air from the outside of the fuel nozzle (51;111); a flame stabilizer (54;71;81;91;114;121) that is provided at a front end portion of the fuel nozzle (51;111) so as to be near an axis center side of the fuel nozzle (51;111); and a rectification member (55;75;95;101;115;122;151) that is provided between an inner wall surface of the fuel nozzle (51;111) and the flame stabilizer (54;71;81;91;114;121), wherein the rectification member (55;75;95;101;115;122;151) is formed in a structure in which first rectification members (65,66) following the horizontal direction and second rectification members (67,68) following the vertical direction are disposed so as to form a frame shape, wherein the respective first rectification members (65,66) include flat portions (65a,66a) which are formed in a flat plate shape having a uniform thickness, wherein the flame stabilizer (54;71;81;91;114;121) is formed in a structure in which a first flame stabilizing member (61,62;72,73;82,83;92,93) disposed in the horizontal direction and a second flame stabilizing member (63,64;84,85) disposed in the vertical direction are disposed so as to intersect each other, and wherein the first flame stabilizing member (61,62;72,73;82,83;92,93) and the second flame stabilizing member (63,64;84,85) respectively include a plurality of flame stabilizing members, a plurality of the first flame stabilizing members (61,62;72,73;82,83;92,93) are disposed in the vertical direction with a predetermined gap therebetween, a plurality of the second flame stabilizing members (63,64;84,85) are disposed in the horizontal direction with a predetermined gap therebetween, and the plurality of first flame stabilizing members (61,62;72,73;82,83;92,93) and the plurality of second flame stabilizing members (63,64;84,85) are disposed so as to intersect each other, and the flame stabilizer (54;71;81;91;114;121) is formed in a double cross split structure in which the first flame stabilizing members (61,62;72,73;82,83;92,93) following the horizontal direction and the second flame stabilizing members (63,64;84,85) following the vertical direction are disposed in a cross shape. a fuel nozzle (51;111) that is arranged to blow a fuel gas obtained by mixing solid fuel with air; a secondary air nozzle (52;112) that is arranged to blow air from the outside of the fuel nozzle (51;111); a flame stabilizer (54;71;81;91;114;121) that is provided at a front end portion of the fuel nozzle (51;111) so as to be near an axis center side of the fuel nozzle (51;111); and a rectification member (55;75;95;101;115;122;151) that is provided between an inner wall surface of the fuel nozzle (51;111) and the flame stabilizer (54;71;81;91;114;121), wherein the rectification member (55;75;95;101;115;122;151) is formed in a structure in which first rectification members (65,66) following the horizontal direction and second rectification members (67,68) following the vertical direction are disposed so as to form a frame shape, wherein the respective first rectification members (65,66) include flat portions (65a,66a) which are formed in a flat plate shape having a uniform thickness, wherein the flame stabilizer (54;71;81;91;114;121) is formed in a structure in which a first flame stabilizing member (61,62;72,73;82,83;92,93) disposed in the horizontal direction and a second flame stabilizing member (63,64;84,85) disposed in the vertical direction are disposed so as to intersect each other, and wherein the first flame stabilizing member (61,62;72,73;82,83;92,93) and the second flame stabilizing member (63,64;84,85) respectively include a plurality of flame stabilizing members, a plurality of the first flame stabilizing members (61,62;72,73;82,83;92,93) are disposed in the vertical direction with a predetermined gap therebetween, a plurality of the second flame stabilizing members (63,64;84,85) are disposed in the horizontal direction with a predetermined gap therebetween, and the plurality of first flame stabilizing members (61,62;72,73;82,83;92,93) and the plurality of second flame stabilizing members (63,64;84,85) are disposed so as to intersect each other, and the flame stabilizer (54;71;81;91;114;121) is formed in a double cross split structure in which the first flame stabilizing members (61,62;72,73;82,83;92,93) following the horizontal direction and the second flame stabilizing members (63,64;84,85) following the vertical direction are disposed in a cross shape.