Fluid handling device and fluid handling system

A fluid handling device comprising:

• an inlet;
• an outlet;
• a first channel through which a droplet is movable when fluid containing the droplet is caused to flow through the first channel, the first channel being connected to the inlet and the outlet;
• a first chamber formed by widening the first channel, the first chamber being configured to capture the droplet moving through the first channel;
• and
• a second chamber to which the droplet captured by the first chamber is movable through the first channel, the second chamber being formed by widening the first channel,
• wherein the fluid handling device is switchable between a first state and a second state by turning the fluid handling device, the first state being a state in which the first chamber is widened to an upper side than the first channel in a vertical direction, and when fluid is caused to flow through the first channel, the droplet moving through the first channel is captured by the first chamber, the second state being a state in which the second chamber is widened to the upper side than the first channel in the vertical direction, and when fluid is caused to flow through the first channel, the droplet captured by the first chamber moves to the second chamber through the first channel.