Liquid supply method and inspection chip

An inspection chip comprising:

• an upstream flow path in which a first liquid and a second liquid are each independently held;
• a combined flow path that combines the first liquid and the second liquid on a downstream side of the upstream flow path;
• and
• a mixing flow path that mixes the first liquid and the second liquid combined on a downstream side of the combined flow path,
• a bottom portion of the combined flow path, being repeatedly provided with height differences in a liquid supply direction of the combined flow path.

An inspection chip comprising:

• an upstream flow path in which a first liquid and a second liquid are each independently held;
• a combined flow path that combines the first liquid and the second liquid on a downstream side of the upstream flow path;
• and
• a mixing flow path that mixes the first liquid and the second liquid combined on a downstream side of the combined flow path,
• a wall surface of the combined flow path being surface-treated.

An inspection chip comprising:

• an upstream flow path in which a first liquid and a second liquid are each independently held;
• a combined flow path that combines the first liquid and the second liquid on a downstream side of the upstream flow path;
• and
• a mixing flow path that mixes the first liquid and the second liquid combined on a downstream side of the combined flow path,
• a wall surface of the combined flow path being a rough surface.