Flow channel device, particle sorting apparatus, particle outflow method, and particle sorting method

A flow channel device, comprising:

• an inflow unit into which a transfer fluid that transfers particles is caused to flow;
• a first outflow unit including an inflow port into which a part of the transfer fluid caused to flow from the inflow unit is caused to flow, a holding unit that is connected to the inflow port and holds particles, and a particle outflow port from which the particles held in the holding unit are caused to flow out to a predetermined flow channel area by the transfer fluid caused to flow from the inflow port;
• and
• a second outflow unit including a peripheral outflow channel through which another part of the transfer fluid caused to flow from the inflow unit is caused to flow out to a peripheral flow channel area that surrounds the predetermined flow channel area,
• wherein the peripheral outflow channel is surrounding at least the particle outflow port,
• wherein the entire peripheral outflow channel has a circular cross section along a plane in a direction perpendicular to a direction of flow of the particles in the predetermined flow channel area.