To obtain a liquid level indicator for measuring the liquid level in a tank continuously utilizing buoyancy emerging or disappearing as the liquid level in the tank moves up and down.

When a buoyancy generating body 14 submerges partially or entirely into a chemical in a storage tank and a buoyancy is generated in the buoyancy generating body 14, magnitude of the buoyancy varies in one and one correspondence with up/down movement of chemical liquid level in the storage tank. At the same time, a light shielding body 17 is moved, in one and one correspondence with up/down movement of chemical liquid level in the storage tank, to a position where the buoyancy of the buoyancy generating body 14 is balanced with the gravity thereof and the urging force of an urging spring 18 is balanced with the gravity of the light shielding body 17. Variable position of the light shielding body 17 is measured analogically by means of a light emitting element 15 and a light receiving element 16.