The present invention relates to a low-price one-way valve device, which transfers refrigerant in one direction such as the direction of a condenser and can prevent a backflow of the refrigerant, and comprises: a valve body having a core guide rod formed at one side thereof, and having at least one fluid inlet into which fluid flows; a valve core capable of being guided so as to be vertically movable by the core guide rod, and capable of regulating the opening degree of the fluid inlet according to the pressure of the fluid; and an elastic member for applying elastic restoring force to the valve core in the direction of the closing of the fluid inlet.
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