Flow path structure and measuring device for liquid to be measured

A flow path structure comprising:

• a base that has
• a separation element accommodation part accommodating a separation element that separates a plurality of components included in a liquid to be measured, and
• a flow path switch member accommodation part provided at an intermediate part of a flow path that guides the liquid to be measured to the separation element accommodation part;
• and
• a flow path switch member provided in the flow path switch member accommodation part,
• wherein
• the flow path switch member switches a state of a flow path inside the base between
• a first flow path state in which the liquid to be measured is guided to an inside of the flow path switch member, and
• a second flow path state in which the liquid to be measured, guided to the inside of the flow path switch member, is guided to an inside of the separation element accommodation part,
• wherein the liquid to be measured, guided to the inside of the flow path switch member, is held and measured when the state of the flow path inside the base makes a transition from the first flow path state to the second flow path state.