Gas-liquid dissolving tank and microscopic bubble generator

In the gas-liquid dissolving tank that promotes dissolution of gas mixed with liquid in the liquid, openings that pass the flowing gas-liquid are formed at an upper portion and a lower portion of a container of the tank, a plurality of separation walls that vertically divide a plurality of chambers are disposed in the container, openings that connect upper and lower chambers are formed through the separation walls, the upper ends of the openings of the separation walls extend predetermined distances upward from the separation walls, and the lower ends of the openings of the separation walls extend predetermined distances downward from the separation walls.