An analog front-end circuit for measurement used as an interface between a sensor and a control device includes: an isolated part including at least an AD conversion circuit configured to serve as an interface to the sensor; a non-isolated part including at least a control circuit configured to serve as an interface to the control device; and an isolated communication unit configured to perform isolated half-duplex communication between the isolated part and the non-isolated part. The control circuit is configured to transmit an AD conversion instruction to the AD conversion circuit after providing setting for measurement to the isolated part via the isolated communication unit, obtain a result of AD conversion by the AD conversion circuit from the isolated part via the isolated communication unit, and transfer the obtained AD conversion result to the control device.