An orthogonal signal output circuit having an error correction function for correcting an orthogonal error, including: first and second differential circuits; and first to fourth variable resistors, wherein the first variable resistor is connected to a positive output of the first differential circuit and a positive output of the second differential circuit; the second variable resistor is connected to the positive output of the first differential circuit and a negative output of the second differential circuit; the third variable resistor is connected to a negative output of the first differential circuit and the positive output of the second differential circuit; and the fourth variable resistor is connected to the negative output of the first differential circuit and the negative output of the second differential circuit.