Liquid propellant tank and vapor jet emitting device including same

A liquid propellant tank (2) for storing a liquid propellant A and supplying vapor produced by evaporation of part of the liquid propellant A to an external location comprises a tank body (21) for storing the liquid propellant A, and a plurality of holder plates (23) arranged inside the tank body, around an axis L of the tank body. The holder plates cause the liquid propellant A to adhere to them by surface tension, thereby establishing, inside the tank body, a liquid propellant holding area LA in which the liquid propellant A is held and a gas accumulation area GA in which vapor produced by evaporation of part of the liquid propellant A accumulates. The tank body has a propellant inlet (21F) open into the liquid propellant holding area LA and a gas outlet (21D) open into the gas accumulation area GA.