PURPOSE: To exactly and speedily measure the quantity of liquid such as water without using various kinds of measuring instruments by integrally applying visible graduations for displaying the required quantity on the inner surface side of the main body of the pot.

CONSTITUTION: The visible graduations for displaying the required quantity are integrally applied on the inner surface of the main body 1 of the pot by pressurization. Therefore, recessed parts 3 similar to the graduations are formed on the side of an outer surface 1a of the main body 1 of the pot and projecting parts corresponding to the recessed parts 3 are formed at prescribed reference intervals on the inner surface of the main body 1 of the pot so that these respective projecting parts existent on the inner surface side can be utilized as visible graduations. Therefore, the quantity of liquid such as water can be exactly and speedily measured only by pouring water, etc., into the main body 1 of the pot while visually confirming the graduations applied in the shape of projections on the inner surface side of the main body 1 of the pot even without using any conventional measuring instrument in the case of using the pot.