Fluid handling system

A fluid handling system comprising:

• a reservoir including a housing part configured to house fluid and an opening disposed in a side surface or a bottom surface of the housing part, the opening being configured to communicate between the housing part and outside;
• a channel chip disposed opposite to the opening of the reservoir, the channel chip including an inlet configured to introduce the fluid, a channel configured to carry the fluid introduced from the inlet, and a protruding part disposed to surround an opening edge of the inlet;
• and
• a cap made of a flexible elastomer and including one end configured to be fit into the opening of the reservoir, another end configured to be connected to the inlet of the channel chip, and a through hole configured to connect the one end and the other end,
• wherein when the opening of the reservoir presses one end side of the cap such that the through hole is closed, a closed state is set, the closed state being a state where the fluid in the housing part does not move to outside through the through hole of the cap,
• wherein when the one end side of the cap is moved from the closed state to a side of the housing part of the reservoir or to a side of the channel chip, pressing on the cap at the opening is released, and an opened state is set, the opened state being a state where the fluid moves to the side of the housing part of the reservoir toward the inlet of the channel chip through the through hole, and
• wherein in the opened state, the protruding part of the channel chip is fit to the through hole on a side of the other end of the cap and suppresses closing of the through hole.