The present invention relates to a liquid storage tank equipped with a liquid level monitoring device. The liquid storage tank includes a tank body that stores a liquid; a liquid level monitoring device that includes a rod member inserted into the liquid and a float member floating on a liquid surface of the liquid, wherein the liquid level monitors device monitors the liquid level of the liquid in accordance with a sliding movement of the float member along the rod member in the vertical direction in response to a change in the liquid level of the liquid; a press member that extends from the outside of the tank body into the tank body and includes a portion outside the tank body and a portion inside the tank body, wherein the portion inside the tank body is in contact with the float member, and the press member presses the float member below the liquid surface of the liquid by using a pressing force applied from the outside of the liquid storage tank to the portion outside the tank body; and a return member, wherein one end of the return member is fixed to the press member, and when the press member presses the float member, the return member applies a return force to the press member so as to return the press member to an initial position where the float member is not pressed by the press member.
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