A steering system, comprising: a steering mechanism configured to turn a steered wheel in response to a steering operation; a motor configured to apply a motor torque to the steering mechanism; a prioritized torque sensor and a redundant torque sensor each configured to detect a steering torque based on a twist of a torsion bar provided on a steering shaft of the steering mechanism, the prioritized torque sensor including a first prioritized detector and a second prioritized detector each configured to output a prioritized detection value depending on the twist of the torsion bar, the redundant torque sensor including a first redundant detector and a second redundant detector each configured to output a redundant detection value depending on the twist of the torsion bar; a controller configured to control actuation of the motor based on the steering torque; characterized by further comprising: a first signal line and a second signal line each connecting the prioritized torque sensor and the controller; and a common signal line (Lc) connecting the redundant torque sensor and the controller, wherein: the prioritized torque sensor is configured to transmit, via the first signal line, a first prioritized detection signal containing the prioritized detection value output from the first prioritized detector; the prioritized torque sensor is configured to transmit, via the second signal line, a second prioritized detection signal containing the prioritized detection value output from the second prioritized detector; and the redundant torque sensor is configured to transmit, via the common signal line (Lc), a first redundant detection signal and a second redundant detection signal containing the redundant detection values output from the first redundant detector and the second redundant detector, respectively. a steering mechanism configured to turn a steered wheel in response to a steering operation; a motor configured to apply a motor torque to the steering mechanism; a prioritized torque sensor and a redundant torque sensor each configured to detect a steering torque based on a twist of a torsion bar provided on a steering shaft of the steering mechanism, the prioritized torque sensor including a first prioritized detector and a second prioritized detector each configured to output a prioritized detection value depending on the twist of the torsion bar, the redundant torque sensor including a first redundant detector and a second redundant detector each configured to output a redundant detection value depending on the twist of the torsion bar; a controller configured to control actuation of the motor based on the steering torque; characterized by further comprising: a first signal line and a second signal line each connecting the prioritized torque sensor and the controller; and a common signal line (Lc) connecting the redundant torque sensor and the controller, wherein: the prioritized torque sensor is configured to transmit, via the first signal line, a first prioritized detection signal containing the prioritized detection value output from the first prioritized detector; the prioritized torque sensor is configured to transmit, via the second signal line, a second prioritized detection signal containing the prioritized detection value output from the second prioritized detector; and the redundant torque sensor is configured to transmit, via the common signal line (Lc), a first redundant detection signal and a second redundant detection signal containing the redundant detection values output from the first redundant detector and the second redundant detector, respectively. a first signal line and a second signal line each connecting the prioritized torque sensor and the controller; and a common signal line (Lc) connecting the redundant torque sensor and the controller, wherein: the prioritized torque sensor is configured to transmit, via the first signal line, a first prioritized detection signal containing the prioritized detection value output from the first prioritized detector; the prioritized torque sensor is configured to transmit, via the second signal line, a second prioritized detection signal containing the prioritized detection value output from the second prioritized detector; and the redundant torque sensor is configured to transmit, via the common signal line (Lc), a first redundant detection signal and a second redundant detection signal containing the redundant detection values output from the first redundant detector and the second redundant detector, respectively. the prioritized torque sensor is configured to transmit, via the first signal line, a first prioritized detection signal containing the prioritized detection value output from the first prioritized detector; the prioritized torque sensor is configured to transmit, via the second signal line, a second prioritized detection signal containing the prioritized detection value output from the second prioritized detector; and the redundant torque sensor is configured to transmit, via the common signal line (Lc), a first redundant detection signal and a second redundant detection signal containing the redundant detection values output from the first redundant detector and the second redundant detector, respectively.