An in-phase corporate-feed circuit comprising: a signal generating circuit configured to divide a signal generated thereby; a first transmission line having a first end connected to the signal generating circuit, and another, second end terminated; a second transmission line having a first end connected to the signal generating circuit, and another, second end terminated; N first branch circuits (6a, 6b,6c; 61a, 61b, 61c) where N is an integer equal to or greater than 2, each first branch circuit being configured to take, from the first transmission line, a part of one of signals obtained by the division in the signal generating circuit; characterized by further comprising N second branch circuits (10a, 10b, 10c; 63a, 63b, 63c), each second branch circuit being configured to take, from the second transmission line, a part of another one of the signals obtained by the division in the signal generating circuit; and N phase adding circuits (12a, 12b, 12c), each phase adding circuit being configured to add a phase of a signal taken by one of the N first branch circuits (6a, 6b, 6c; 61a, 61b, 61c) which is n-th when counted from the first end of the first transmission line where n is a positive integer equal to or less than N, and a phase of a signal taken by one of the N second branch circuits (10a, 10b, 10c; 63a, 63b, 63c) which is n-th when counted from the other, second end of the second transmission line, wherein an electric length of the first transmission line between one of the first branch circuits (6a, 6b, 6c; 61a, 61b, 61c) which is m-th when counted from the first end of the first transmission line where m is a positive integer equal to or less than N-1, and another one of the first branch circuits (6a, 6b, 6c; 61a, 61b, 61c) which is (m+1)-th when counted from the first end of the first transmission line, is equal to an electric length of the second transmission line between one of the second branch circuits (10a, 10b, 10c; 63a, 63b, 63c) which is m-th when counted from the other, second end of the second transmission line, and another one of the second branch circuits (10a, 10b, 10c; 63a, 63b, 63c) which is (m+1)-th when counted from the other, second end of the second transmission line so as to generate plural signals having equal phases from a single signal. a signal generating circuit configured to divide a signal generated thereby; a first transmission line having a first end connected to the signal generating circuit, and another, second end terminated; a second transmission line having a first end connected to the signal generating circuit, and another, second end terminated; N first branch circuits (6a, 6b,6c; 61a, 61b, 61c) where N is an integer equal to or greater than 2, each first branch circuit being configured to take, from the first transmission line, a part of one of signals obtained by the division in the signal generating circuit; characterized by further comprising N second branch circuits (10a, 10b, 10c; 63a, 63b, 63c), each second branch circuit being configured to take, from the second transmission line, a part of another one of the signals obtained by the division in the signal generating circuit; and N phase adding circuits (12a, 12b, 12c), each phase adding circuit being configured to add a phase of a signal taken by one of the N first branch circuits (6a, 6b, 6c; 61a, 61b, 61c) which is n-th when counted from the first end of the first transmission line where n is a positive integer equal to or less than N, and a phase of a signal taken by one of the N second branch circuits (10a, 10b, 10c; 63a, 63b, 63c) which is n-th when counted from the other, second end of the second transmission line, wherein an electric length of the first transmission line between one of the first branch circuits (6a, 6b, 6c; 61a, 61b, 61c) which is m-th when counted from the first end of the first transmission line where m is a positive integer equal to or less than N-1, and another one of the first branch circuits (6a, 6b, 6c; 61a, 61b, 61c) which is (m+1)-th when counted from the first end of the first transmission line, is equal to an electric length of the second transmission line between one of the second branch circuits (10a, 10b, 10c; 63a, 63b, 63c) which is m-th when counted from the other, second end of the second transmission line, and another one of the second branch circuits (10a, 10b, 10c; 63a, 63b, 63c) which is (m+1)-th when counted from the other, second end of the second transmission line so as to generate plural signals having equal phases from a single signal.