Abstract: In a liquid tank, a sectional area of a liquid flow path when viewed in a liquid circulation direction is set large when a contact angle between a liquid and a tank body is large, and the liquid in circulation is not in contact with the upper lid member.

Abstract: Provided are a liquid circulating apparatus capable of suppressing a concentration variation of a liquid to be supplied, and a measurement apparatus having the liquid circulating apparatus. A buffer liquid circulating apparatus 71 comprises a bottle 72, a buffer tank 74, a pump 75, a supply path 76 and a return path 77. The bottle 72 and the buffer tank 74 are connected to the supply path 76 and the return path 77, and the pump 57 is connected to the return path 77. The supply path 76 and the return path 77 are constituted of a tube to become a flow path for the buffer liquid.