An exhalation measurement device, comprising: a handle component into which a user exhales; a flow regulator that is provided downstream from the handle component and adjusts a flow of exhalation blown in from the handle component; a chamber that is provided downstream from the flow regulator and temporarily stores exhalation; an opening component (6a, 6b) that is provided to the chamber and opens up the flow regulator to atmospheric pressure; a measurement component that measures a specific component in exhalation; and a pump that is provided downstream from the chamber and sends exhalation into the measurement component, wherein the flow regulator has: an exhalation inflow component where exhalation flows in from the handle component side; an exhalation outflow component where exhalation flows out to the chamber side; a flow adjuster that is provided between the exhalation inflow component and the exhalation outflow component and adjusts a flow of exhalation; a driver that drives the flow adjuster; an inflow pressure sensor that senses a pressure of the exhalation inflow component and is disposed on the exhalation inflow component side of the flow adjuster; and a controller that controls the driver; characterised in that the exhalation measurement device further comprises: an outflow pressure sensor that senses a pressure of the exhalation outflow component and is disposed on the exhalation outflow component side of the flow adjuster; and the controller has: a first offset adjuster that causes the driver to drive the flow adjuster and create a separated state between the exhalation inflow component and the exhalation outflow component, and performs first offset adjustment of the inflow pressure sensor and the outflow pressure sensor; a voltage difference detector that causes the driver to drive the flow adjuster and create a linked state between the exhalation inflow component and the exhalation outflow component, and detects an output voltage difference after the first offset adjustment of the inflow pressure sensor and the outflow pressure sensor; and a second offset adjuster that uses the output voltage difference to perform second offset adjustment of the inflow pressure sensor. a handle component into which a user exhales; a flow regulator that is provided downstream from the handle component and adjusts a flow of exhalation blown in from the handle component; a chamber that is provided downstream from the flow regulator and temporarily stores exhalation; an opening component (6a, 6b) that is provided to the chamber and opens up the flow regulator to atmospheric pressure; a measurement component that measures a specific component in exhalation; and a pump that is provided downstream from the chamber and sends exhalation into the measurement component, wherein the flow regulator has: an exhalation inflow component where exhalation flows in from the handle component side; an exhalation outflow component where exhalation flows out to the chamber side; a flow adjuster that is provided between the exhalation inflow component and the exhalation outflow component and adjusts a flow of exhalation; a driver that drives the flow adjuster; an inflow pressure sensor that senses a pressure of the exhalation inflow component and is disposed on the exhalation inflow component side of the flow adjuster; and a controller that controls the driver; an exhalation inflow component where exhalation flows in from the handle component side; an exhalation outflow component where exhalation flows out to the chamber side; a flow adjuster that is provided between the exhalation inflow component and the exhalation outflow component and adjusts a flow of exhalation; a driver that drives the flow adjuster; an inflow pressure sensor that senses a pressure of the exhalation inflow component and is disposed on the exhalation inflow component side of the flow adjuster; and a controller that controls the driver; an outflow pressure sensor that senses a pressure of the exhalation outflow component and is disposed on the exhalation outflow component side of the flow adjuster; and the controller has: a first offset adjuster that causes the driver to drive the flow adjuster and create a separated state between the exhalation inflow component and the exhalation outflow component, and performs first offset adjustment of the inflow pressure sensor and the outflow pressure sensor; a voltage difference detector that causes the driver to drive the flow adjuster and create a linked state between the exhalation inflow component and the exhalation outflow component, and detects an output voltage difference after the first offset adjustment of the inflow pressure sensor and the outflow pressure sensor; and a second offset adjuster that uses the output voltage difference to perform second offset adjustment of the inflow pressure sensor. a first offset adjuster that causes the driver to drive the flow adjuster and create a separated state between the exhalation inflow component and the exhalation outflow component, and performs first offset adjustment of the inflow pressure sensor and the outflow pressure sensor; a voltage difference detector that causes the driver to drive the flow adjuster and create a linked state between the exhalation inflow component and the exhalation outflow component, and detects an output voltage difference after the first offset adjustment of the inflow pressure sensor and the outflow pressure sensor; and a second offset adjuster that uses the output voltage difference to perform second offset adjustment of the inflow pressure sensor.