Liquid transfer monitoring method and sample measuring device

A sample measuring device that transfers a liquid to a flow path having at least two liquid holding portions and performs measurement using the liquid, the measuring device comprising:

• a liquid feeding pump that applies an external force to the liquid held in a first liquid holding portion and transfers the liquid to a second liquid holding portion connected to the first liquid holding portion;
• a light source that irradiates light on an irregular inner surface of at least one of the first liquid holding portion and the second liquid holding portion;
• a photodetector for detecting scattered light originating from light irradiated on the irregular inner surface;
• a controller configured to acquire information related to scattered light based on signals from the photodetector, and determine a presence or absence of a liquid within the first liquid holding portion, the second liquid holding portion, or both, based on the information related to the scattered light;
• and
• a measurement unit comprising the photodetector that performs measurement using the liquid,
• wherein the controller is configured to direct transfer of the liquid from the first liquid holding portion to the second liquid holding portion, cause the light source to irradiate light on the irregular inner surface after the transfer of the liquid from the first liquid holding portion to the second liquid holding portion is completed and flow of the liquid has stopped, and determine anomalies resulting from the transfer of the liquid from the first liquid holding portion to the second liquid holding portion.