Abstract: Disclosed is a liquid storage container comprising a liquid reservoir part holding liquid, an air communication part including an air communication port communicating with the atmosphere, an inner port communicating the liquid reservoir part with the air communication part, a seal member closing the inner port from the inside of the air communication part, a first biasing member biasing the seal member in a first direction from a first position away from the inner port toward a second position of closing the inner port, and a pressure receiving part including a protruding portion protruding from the air communication port to the outside of the air communication part, and joined to the seal member or the first biasing member. The seal member is separated from the inner port when the protruding portion of the pressure receiving part is pushed in a second direction opposite to the first direction.