Flow channel device, analysis apparatus, and fluid apparatus

A flow channel device, comprising:

• a vessel layer including an injection vessel section into which a fluid including a sample is injected and a collection vessel section that collects the fluid;
• and
• a flow channel layer that includes a flow channel connected to the injection vessel section and the collection vessel section and is bonded to the vessel layer, wherein:
• the vessel layer includes a first inflow channel, the first inflow channel communicating with the flow channel of the flow channel layer;
• the flow channel of the flow channel layer includes a first flow channel connected to the first inflow channel, and includes an injection vessel inflow channel and an injection vessel outflow channel that are branched from the first flow channel and connected to the injection vessel section;
• the injection vessel outflow channel has a smaller flow channel cross-sectional area than the first flow channel and is connected to the first flow channel at a center position of a width of the first flow channel in a direction orthogonal to a flowing direction of the fluid;
• the collection vessel section includes a through hole in the vessel layer and a concave member located in the through hole, the concave member having a concave accumulation region and having a depth less than a depth of the through hole in the vessel layer, thereby defining a shallow area of the collection vessel section above the concave member;
• and
• the flow channel is connected to the shallow area of the collection vessel section.